12015721525 has 48 divisors (see below), whose sum is σ = 16305384960. Its totient is φ = 8755084800.

The previous prime is 12015721517. The next prime is 12015721561. The reversal of 12015721525 is 52512751021.

It is a happy number.

It is not a de Polignac number, because 12015721525 - 2³ = 12015721517 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1212340 + ... + 1222210.

It is an arithmetic number, because the mean of its divisors is an integer number (339695520).

Almost surely, 2^12015721525 is an apocalyptic number.

It is an amenable number.

12015721525 is a deficient number, since it is larger than the sum of its proper divisors (4289663435).

12015721525 is a wasteful number, since it uses less digits than its factorization.

12015721525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10006 (or 10001 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 31.

The spelling of 12015721525 in words is "twelve billion, fifteen million, seven hundred twenty-one thousand, five hundred twenty-five".