2557825307787 has 4 divisors (see below), whose sum is σ = 3410433743720. Its totient is φ = 1705216871856.

The previous prime is 2557825307783. The next prime is 2557825307857. The reversal of 2557825307787 is 7877035287552.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2557825307787 - 2² = 2557825307783 is a prime.

It is a super-2 number, since 2×2557825307787² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2557825307783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426304217962 + ... + 426304217967.

It is an arithmetic number, because the mean of its divisors is an integer number (852608435930).

Almost surely, 2^{2557825307787} is an apocalyptic number.

2557825307787 is a deficient number, since it is larger than the sum of its proper divisors (852608435933).

2557825307787 is an equidigital number, since it uses as much as digits as its factorization.

2557825307787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852608435932.

The product of its (nonzero) digits is 230496000, while the sum is 66.

The spelling of 2557825307787 in words is "two trillion, five hundred fifty-seven billion, eight hundred twenty-five million, three hundred seven thousand, seven hundred eighty-seven".