12702720657 has 16 divisors (see below), whose sum is σ = 18528168960. Its totient is φ = 7677166800.

The previous prime is 12702720649. The next prime is 12702720661. The reversal of 12702720657 is 75602720721.

It is not a de Polignac number, because 12702720657 - 2³ = 12702720649 is a prime.

It is a super-2 number, since 2×12702720657² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12702720607) 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, 524269 + ... + 547962.

It is an arithmetic number, because the mean of its divisors is an integer number (1158010560).

Almost surely, 2^12702720657 is an apocalyptic number.

It is an amenable number.

12702720657 is a deficient number, since it is larger than the sum of its proper divisors (5825448303).

12702720657 is a wasteful number, since it uses less digits than its factorization.

12702720657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072604.

The product of its (nonzero) digits is 82320, while the sum is 39.

The spelling of 12702720657 in words is "twelve billion, seven hundred two million, seven hundred twenty thousand, six hundred fifty-seven".