12942512639 has 16 divisors (see below), whose sum is σ = 15349152000. Its totient is φ = 10905538392.

The previous prime is 12942512593. The next prime is 12942512659. The reversal of 12942512639 is 93621524921.

It is a happy number.

It is not a de Polignac number, because 12942512639 - 2⁸ = 12942512383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12942512639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12942512659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299537 + ... + 340010.

It is an arithmetic number, because the mean of its divisors is an integer number (959322000).

Almost surely, 2^12942512639 is an apocalyptic number.

12942512639 is a deficient number, since it is larger than the sum of its proper divisors (2406639361).

12942512639 is an frugal number, since it uses more digits than its factorization.

12942512639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639627 (or 639613 counting only the distinct ones).

The product of its digits is 233280, while the sum is 44.

The spelling of 12942512639 in words is "twelve billion, nine hundred forty-two million, five hundred twelve thousand, six hundred thirty-nine".