2640501656 has 32 divisors (see below), whose sum is σ = 5359737600. Its totient is φ = 1212303360.

The previous prime is 2640501653. The next prime is 2640501697. The reversal of 2640501656 is 6561050462.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640501653) 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 7 ways as a sum of consecutive naturals, for example, 46601 + ... + 86328.

It is an arithmetic number, because the mean of its divisors is an integer number (167491800).

Almost surely, 2^2640501656 is an apocalyptic number.

2640501656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2640501656 is an abundant number, since it is smaller than the sum of its proper divisors (2719235944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2640501656 is a wasteful number, since it uses less digits than its factorization.

2640501656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133139 (or 133135 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 2640501656 is about 51385.8118161035. The cubic root of 2640501656 is about 1382.1721822578.

The spelling of 2640501656 in words is "two billion, six hundred forty million, five hundred one thousand, six hundred fifty-six".