2556131031620 has 24 divisors (see below), whose sum is σ = 5368335353304. Its totient is φ = 1022364758016.

The previous prime is 2556131031577. The next prime is 2556131031637. The reversal of 2556131031620 is 261301316552.

It can be written as a sum of positive squares in 4 ways, for example, as 1454672385604 + 1101458646016 = 1206098^2 + 1049504^2 .

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, 5239037 + ... + 5706116.

It is an arithmetic number, because the mean of its divisors is an integer number (223680639721).

Almost surely, 2^{2556131031620} is an apocalyptic number.

2556131031620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2556131031620 is an abundant number, since it is smaller than the sum of its proper divisors (2812204321684).

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

2556131031620 is a wasteful number, since it uses less digits than its factorization.

2556131031620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10956839 (or 10956837 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 2556131031620 in words is "two trillion, five hundred fifty-six billion, one hundred thirty-one million, thirty-one thousand, six hundred twenty".