25640211536 has 20 divisors (see below), whose sum is σ = 49680576564. Its totient is φ = 12819417600.

The previous prime is 25640211491. The next prime is 25640211547. The reversal of 25640211536 is 63511204652.

It can be written as a sum of positive squares in 2 ways, for example, as 13123077136 + 12517134400 = 114556^2 + 111880^2 .

It is a super-2 number, since 2×25640211536² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25640211496 and 25640211505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407126 + ... + 465866.

Almost surely, 2^25640211536 is an apocalyptic number.

It is an amenable number.

25640211536 is a deficient number, since it is larger than the sum of its proper divisors (24040365028).

25640211536 is a wasteful number, since it uses less digits than its factorization.

25640211536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86030 (or 86024 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 25640211536 in words is "twenty-five billion, six hundred forty million, two hundred eleven thousand, five hundred thirty-six".