25523257638 has 32 divisors (see below), whose sum is σ = 52574828256. Its totient is φ = 8254338048.

The previous prime is 25523257609. The next prime is 25523257651. The reversal of 25523257638 is 83675232552.

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, 84481 + ... + 241212.

It is an arithmetic number, because the mean of its divisors is an integer number (1642963383).

Almost surely, 2^25523257638 is an apocalyptic number.

25523257638 is an abundant number, since it is smaller than the sum of its proper divisors (27051570618).

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

25523257638 is a wasteful number, since it uses less digits than its factorization.

25523257638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326088.

The product of its digits is 3024000, while the sum is 48.

The spelling of 25523257638 in words is "twenty-five billion, five hundred twenty-three million, two hundred fifty-seven thousand, six hundred thirty-eight".