25766161616 has 20 divisors (see below), whose sum is σ = 53762087652. Its totient is φ = 11892074496.

The previous prime is 25766161609. The next prime is 25766161637. The reversal of 25766161616 is 61616166752.

It can be written as a sum of positive squares in 2 ways, for example, as 15301690000 + 10464471616 = 123700^2 + 102296^2 .

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, 61937681 + ... + 61938096.

Almost surely, 2^25766161616 is an apocalyptic number.

25766161616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

25766161616 is an abundant number, since it is smaller than the sum of its proper divisors (27995926036).

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

25766161616 is a wasteful number, since it uses less digits than its factorization.

25766161616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123875798 (or 123875792 counting only the distinct ones).

The product of its digits is 544320, while the sum is 47.

The spelling of 25766161616 in words is "twenty-five billion, seven hundred sixty-six million, one hundred sixty-one thousand, six hundred sixteen".