25611625816 has 32 divisors (see below), whose sum is σ = 55245530880. Its totient is φ = 10903716000.

The previous prime is 25611625777. The next prime is 25611625817. The reversal of 25611625816 is 61852611652.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25611625817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1505950 + ... + 1522861.

It is an arithmetic number, because the mean of its divisors is an integer number (1726422840).

Almost surely, 2^25611625816 is an apocalyptic number.

It is an amenable number.

25611625816 is an abundant number, since it is smaller than the sum of its proper divisors (29633905064).

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

25611625816 is a wasteful number, since it uses less digits than its factorization.

25611625816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028975 (or 3028971 counting only the distinct ones).

The product of its digits is 172800, while the sum is 43.

The spelling of 25611625816 in words is "twenty-five billion, six hundred eleven million, six hundred twenty-five thousand, eight hundred sixteen".