2649526721 has 8 divisors (see below), whose sum is σ = 2807364744. Its totient is φ = 2491909120.

The previous prime is 2649526703. The next prime is 2649526757. The reversal of 2649526721 is 1276259462.

2649526721 is digitally balanced in base 2, 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 4 ways, for example, as 1733556496 + 915970225 = 41636^2 + 30265^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2649526721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2649526771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30020 + ... + 78741.

It is an arithmetic number, because the mean of its divisors is an integer number (350920593).

Almost surely, 2^2649526721 is an apocalyptic number.

It is an amenable number.

2649526721 is a deficient number, since it is larger than the sum of its proper divisors (157838023).

2649526721 is a wasteful number, since it uses less digits than its factorization.

2649526721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110211.

The product of its digits is 362880, while the sum is 44.

The square root of 2649526721 is about 51473.5536076537. The cubic root of 2649526721 is about 1383.7451167903.

The spelling of 2649526721 in words is "two billion, six hundred forty-nine million, five hundred twenty-six thousand, seven hundred twenty-one".