2647385991 has 16 divisors (see below), whose sum is σ = 3988531200. Its totient is φ = 1735008984.

The previous prime is 2647385989. The next prime is 2647385999. The reversal of 2647385991 is 1995837462.

2647385991 is a `hidden beast` number, since 2 + 6 + 47 + 3 + 8 + 599 + 1 = 666.

It is not a de Polignac number, because 2647385991 - 2¹ = 2647385989 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2647385999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 829351 + ... + 832536.

It is an arithmetic number, because the mean of its divisors is an integer number (249283200).

Almost surely, 2^2647385991 is an apocalyptic number.

2647385991 is a deficient number, since it is larger than the sum of its proper divisors (1341145209).

2647385991 is a wasteful number, since it uses less digits than its factorization.

2647385991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661955 (or 1661949 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 2647385991 is about 51452.7549408193. The cubic root of 2647385991 is about 1383.3723429395.

The spelling of 2647385991 in words is "two billion, six hundred forty-seven million, three hundred eighty-five thousand, nine hundred ninety-one".