12657638897 has 8 divisors (see below), whose sum is σ = 12868659240. Its totient is φ = 12446732160.

The previous prime is 12657638891. The next prime is 12657638957. The reversal of 12657638897 is 79883675621.

It can be written as a sum of positive squares in 4 ways, for example, as 2895408481 + 9762230416 = 53809^2 + 98804^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12657638897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12657638891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213263 + ... + 266075.

It is an arithmetic number, because the mean of its divisors is an integer number (1608582405).

Almost surely, 2^12657638897 is an apocalyptic number.

It is an amenable number.

12657638897 is a deficient number, since it is larger than the sum of its proper divisors (211020343).

12657638897 is an equidigital number, since it uses as much as digits as its factorization.

12657638897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56803.

The product of its digits is 30481920, while the sum is 62.

The spelling of 12657638897 in words is "twelve billion, six hundred fifty-seven million, six hundred thirty-eight thousand, eight hundred ninety-seven".