25320520016 has 30 divisors (see below), whose sum is σ = 53923818186. Its totient is φ = 11509326400.

The previous prime is 25320520009. The next prime is 25320520037. The reversal of 25320520016 is 61002502352.

It can be written as a sum of positive squares in only one way, i.e., 20764810000 + 4555710016 = 144100^2 + 67496^2 .

It is a super-2 number, since 2×25320520016² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6537455 + ... + 6541326.

Almost surely, 2^25320520016 is an apocalyptic number.

It is an amenable number.

25320520016 is an abundant number, since it is smaller than the sum of its proper divisors (28603298170).

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

25320520016 is a wasteful number, since it uses less digits than its factorization.

25320520016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13078811 (or 13078794 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 25320520016 in words is "twenty-five billion, three hundred twenty million, five hundred twenty thousand, sixteen".