25312900687081 has 16 divisors (see below), whose sum is σ = 30451986904960. Its totient is φ = 20554582135680.

The previous prime is 25312900687069. The next prime is 25312900687133. The reversal of 25312900687081 is 18078600921352.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25312900687081 - 2³¹ = 25310753203433 is a prime.

It is a super-2 number, since 2×25312900687081² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25312900687001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10000591 + ... + 12273451.

It is an arithmetic number, because the mean of its divisors is an integer number (1903249181560).

Almost surely, 2^{25312900687081} is an apocalyptic number.

25312900687081 is the 3182006-th heptagonal number.

25312900687081 is the 2904761-st hex number.

It is an amenable number.

25312900687081 is a deficient number, since it is larger than the sum of its proper divisors (5139086217879).

25312900687081 is a wasteful number, since it uses less digits than its factorization.

25312900687081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356624.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 25312900687081 in words is "twenty-five trillion, three hundred twelve billion, nine hundred million, six hundred eighty-seven thousand, eighty-one".