25990535766 has 32 divisors (see below), whose sum is σ = 56020618080. Its totient is φ = 7991230464.

The previous prime is 25990535741. The next prime is 25990535771. The reversal of 25990535766 is 66753509952.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14251 + ... + 228438.

It is an arithmetic number, because the mean of its divisors is an integer number (1750644315).

Almost surely, 2^25990535766 is an apocalyptic number.

25990535766 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

25990535766 is an abundant number, since it is smaller than the sum of its proper divisors (30030082314).

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

25990535766 is a wasteful number, since it uses less digits than its factorization.

25990535766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244080.

The product of its (nonzero) digits is 15309000, while the sum is 57.

The spelling of 25990535766 in words is "twenty-five billion, nine hundred ninety million, five hundred thirty-five thousand, seven hundred sixty-six".