2649371805 has 18 divisors (see below), whose sum is σ = 4592843034. Its totient is φ = 1412814144.

The previous prime is 2649371801. The next prime is 2649371819. The reversal of 2649371805 is 5081739462.

2649371805 is digitally balanced in base 10, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 514654596 + 2134717209 = 22686^2 + 46203^2 .

It is not a de Polignac number, because 2649371805 - 2² = 2649371801 is a prime.

It is a super-2 number, since 2×2649371805² = 14038341922257916050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

2649371805 is strictly pandigital in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2649371801) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 341449 + ... + 349121.

It is a 2-persistent number, because it is pandigital, and so is 2⋅2649371805 = 5298743610, but 3⋅2649371805 = 7948115415 is not.

Almost surely, 2^2649371805 is an apocalyptic number.

It is an amenable number.

2649371805 is a deficient number, since it is larger than the sum of its proper divisors (1943471229).

2649371805 is an frugal number, since it uses more digits than its factorization.

2649371805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15357 (or 7681 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 2649371805 is about 51472.0487740677. The cubic root of 2649371805 is about 1383.7181473905.

Multiplying 2649371805 by its sum of digits (45), we get a square (119221731225 = 345285²).

2649371805 divided by its sum of digits (45) gives a square (58874929 = 7673²).

The spelling of 2649371805 in words is "two billion, six hundred forty-nine million, three hundred seventy-one thousand, eight hundred five".