25521623425 has 12 divisors (see below), whose sum is σ = 32667678976. Its totient is φ = 19758675600.

The previous prime is 25521623341. The next prime is 25521623431. The reversal of 25521623425 is 52432612552.

It is not a de Polignac number, because 25521623425 - 2⁹ = 25521622913 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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, 16464789 + ... + 16466338.

Almost surely, 2^25521623425 is an apocalyptic number.

25521623425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25521623425 is a deficient number, since it is larger than the sum of its proper divisors (7146055551).

25521623425 is a wasteful number, since it uses less digits than its factorization.

25521623425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32931168 (or 32931163 counting only the distinct ones).

The product of its digits is 144000, while the sum is 37.

The spelling of 25521623425 in words is "twenty-five billion, five hundred twenty-one million, six hundred twenty-three thousand, four hundred twenty-five".