2657501257640 has 32 divisors (see below), whose sum is σ = 6038579599560. Its totient is φ = 1052475744000.

The previous prime is 2657501257637. The next prime is 2657501257661. The reversal of 2657501257640 is 467521057562.

It can be written as a sum of positive squares in 4 ways, for example, as 2587664738884 + 69836518756 = 1608622^2 + 264266^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328894631 + ... + 328902710.

Almost surely, 2^{2657501257640} is an apocalyptic number.

2657501257640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2657501257640 is an abundant number, since it is smaller than the sum of its proper divisors (3381078341920).

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

2657501257640 is a wasteful number, since it uses less digits than its factorization.

2657501257640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657797453 (or 657797449 counting only the distinct ones).

The product of its (nonzero) digits is 3528000, while the sum is 50.

The spelling of 2657501257640 in words is "two trillion, six hundred fifty-seven billion, five hundred one million, two hundred fifty-seven thousand, six hundred forty".