12512512639 has 4 divisors (see below), whose sum is σ = 13650013800. Its totient is φ = 11375011480.

The previous prime is 12512512613. The next prime is 12512512657. The reversal of 12512512639 is 93621521521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12512512639 - 2⁹ = 12512512127 is a prime.

It is a super-2 number, since 2×12512512639² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12512512598 and 12512512607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12512512679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568750564 + ... + 568750585.

It is an arithmetic number, because the mean of its divisors is an integer number (3412503450).

Almost surely, 2^12512512639 is an apocalyptic number.

12512512639 is a deficient number, since it is larger than the sum of its proper divisors (1137501161).

12512512639 is a wasteful number, since it uses less digits than its factorization.

12512512639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137501160.

The product of its digits is 32400, while the sum is 37.

The spelling of 12512512639 in words is "twelve billion, five hundred twelve million, five hundred twelve thousand, six hundred thirty-nine".