23551506225 has 81 divisors (see below), whose sum is σ = 45735958593. Its totient is φ = 11579855040.

The previous prime is 23551506211. The next prime is 23551506233. The reversal of 23551506225 is 52260515532.

The square root of 23551506225 is 153465.

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

23551506225 is a `hidden beast` number, since 23 + 5 + 5 + 1 + 5 + 0 + 622 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6070435569 + 17481070656 = 77913^2 + 132216^2 .

It is not a de Polignac number, because 23551506225 - 2¹⁵ = 23551473457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23551506225.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 29925282 + ... + 29926068.

Almost surely, 2^23551506225 is an apocalyptic number.

23551506225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

23551506225 is the 153465-th square number.

23551506225 is the 76733-rd centered octagonal number.

It is an amenable number.

23551506225 is a deficient number, since it is larger than the sum of its proper divisors (22184452368).

23551506225 is an equidigital number, since it uses as much as digits as its factorization.

23551506225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616 (or 808 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

Multiplying 23551506225 by its sum of digits (36), we get a square (847854224100 = 920790²).

The spelling of 23551506225 in words is "twenty-three billion, five hundred fifty-one million, five hundred six thousand, two hundred twenty-five".