2640856309476 has 144 divisors (see below), whose sum is σ = 7898666563200. Its totient is φ = 685936574400.

The previous prime is 2640856309423. The next prime is 2640856309493. The reversal of 2640856309476 is 6749036580462.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2153235 + ... + 3149306.

Almost surely, 2^{2640856309476} is an apocalyptic number.

It is an amenable number.

2640856309476 is an abundant number, since it is smaller than the sum of its proper divisors (5257810253724).

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

2640856309476 is a wasteful number, since it uses less digits than its factorization.

2640856309476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5302591 (or 5302564 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 60.

The spelling of 2640856309476 in words is "two trillion, six hundred forty billion, eight hundred fifty-six million, three hundred nine thousand, four hundred seventy-six".