2656640835 has 80 divisors (see below), whose sum is σ = 4937264640. Its totient is φ = 1365698880.

The previous prime is 2656640827. The next prime is 2656640839. The reversal of 2656640835 is 5380466562.

2656640835 is a `hidden beast` number, since 2 + 6 + 566 + 4 + 0 + 83 + 5 = 666.

It is not a de Polignac number, because 2656640835 - 2³ = 2656640827 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (2656640839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1374820 + ... + 1376750.

It is an arithmetic number, because the mean of its divisors is an integer number (61715808).

Almost surely, 2^2656640835 is an apocalyptic number.

2656640835 is a deficient number, since it is larger than the sum of its proper divisors (2280623805).

2656640835 is a wasteful number, since it uses less digits than its factorization.

2656640835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070 (or 2061 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The square root of 2656640835 is about 51542.6118371974. The cubic root of 2656640835 is about 1384.9824853229.

The spelling of 2656640835 in words is "two billion, six hundred fifty-six million, six hundred forty thousand, eight hundred thirty-five".