25902128989572 has 36 divisors (see below), whose sum is σ = 66432182067888. Its totient is φ = 7849129996400.

The previous prime is 25902128989547. The next prime is 25902128989613. The reversal of 25902128989572 is 27598982120952.

It is a happy number.

It is a super-4 number, since 4×25902128989572⁴ (a number of 55 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25902128989497 and 25902128989506.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8919464454 + ... + 8919467357.

Almost surely, 2^{25902128989572} is an apocalyptic number.

25902128989572 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

25902128989572 is an abundant number, since it is smaller than the sum of its proper divisors (40530053078316).

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

25902128989572 is a wasteful number, since it uses less digits than its factorization.

25902128989572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17838931840 (or 17838931827 counting only the distinct ones).

The product of its (nonzero) digits is 130636800, while the sum is 69.

The spelling of 25902128989572 in words is "twenty-five trillion, nine hundred two billion, one hundred twenty-eight million, nine hundred eighty-nine thousand, five hundred seventy-two".