25640566545 has 32 divisors (see below), whose sum is σ = 45964033920. Its totient is φ = 12095792640.

The previous prime is 25640566531. The next prime is 25640566547. The reversal of 25640566545 is 54566504652.

It is not a de Polignac number, because 25640566545 - 2⁵ = 25640566513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25640566494 and 25640566503.

It is not an unprimeable number, because it can be changed into a prime (25640566547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2093860 + ... + 2106069.

It is an arithmetic number, because the mean of its divisors is an integer number (1436376060).

Almost surely, 2^25640566545 is an apocalyptic number.

It is an amenable number.

25640566545 is a deficient number, since it is larger than the sum of its proper divisors (20323467375).

25640566545 is a wasteful number, since it uses less digits than its factorization.

25640566545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4199985.

The product of its (nonzero) digits is 4320000, while the sum is 48.

The spelling of 25640566545 in words is "twenty-five billion, six hundred forty million, five hundred sixty-six thousand, five hundred forty-five".