25522618564 has 45 divisors (see below), whose sum is σ = 47006068431. Its totient is φ = 12125632200.

The previous prime is 25522618549. The next prime is 25522618601. The reversal of 25522618564 is 46581622552.

The square root of 25522618564 is 159758.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 169023889 + ... + 169024039.

Almost surely, 2^25522618564 is an apocalyptic number.

25522618564 is the 159758-th square number.

It is an amenable number.

25522618564 is a deficient number, since it is larger than the sum of its proper divisors (21483449867).

25522618564 is an frugal number, since it uses more digits than its factorization.

25522618564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 176 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 46.

The spelling of 25522618564 in words is "twenty-five billion, five hundred twenty-two million, six hundred eighteen thousand, five hundred sixty-four".