25986820560 has 40 divisors (see below), whose sum is σ = 80559144480. Its totient is φ = 6929818752.

The previous prime is 25986820507. The next prime is 25986820567. The reversal of 25986820560 is 6502868952.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25986820567) 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, 54138970 + ... + 54139449.

It is an arithmetic number, because the mean of its divisors is an integer number (2013978612).

Almost surely, 2^25986820560 is an apocalyptic number.

25986820560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25986820560 is an abundant number, since it is smaller than the sum of its proper divisors (54572323920).

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

25986820560 is a wasteful number, since it uses less digits than its factorization.

25986820560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108278435 (or 108278429 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 51.

The spelling of 25986820560 in words is "twenty-five billion, nine hundred eighty-six million, eight hundred twenty thousand, five hundred sixty".