25711724772 has 36 divisors (see below), whose sum is σ = 65101723596. Its totient is φ = 8556307200.

The previous prime is 25711724761. The next prime is 25711724777. The reversal of 25711724772 is 27742711752.

25711724772 is a `hidden beast` number, since 2 + 5 + 7 + 1 + 172 + 477 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15263614116 + 10448110656 = 123546^2 + 102216^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×25711724772² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25711724777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 572553 + ... + 615824.

It is an arithmetic number, because the mean of its divisors is an integer number (1808381211).

Almost surely, 2^25711724772 is an apocalyptic number.

It is an amenable number.

25711724772 is an abundant number, since it is smaller than the sum of its proper divisors (39389998824).

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

25711724772 is a wasteful number, since it uses less digits than its factorization.

25711724772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188988 (or 1188983 counting only the distinct ones).

The product of its digits is 384160, while the sum is 45.

The spelling of 25711724772 in words is "twenty-five billion, seven hundred eleven million, seven hundred twenty-four thousand, seven hundred seventy-two".