12689395645 has 16 divisors (see below), whose sum is σ = 15280176960. Its totient is φ = 10116296064.

The previous prime is 12689395583. The next prime is 12689395657. The reversal of 12689395645 is 54659398621.

It is a cyclic number.

It is not a de Polignac number, because 12689395645 - 2²¹ = 12687298493 is a prime.

It is a super-2 number, since 2×12689395645² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12689395645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3308649 + ... + 3312481.

It is an arithmetic number, because the mean of its divisors is an integer number (955011060).

Almost surely, 2^12689395645 is an apocalyptic number.

It is an amenable number.

12689395645 is a deficient number, since it is larger than the sum of its proper divisors (2590781315).

12689395645 is a wasteful number, since it uses less digits than its factorization.

12689395645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5964.

The product of its digits is 13996800, while the sum is 58.

The spelling of 12689395645 in words is "twelve billion, six hundred eighty-nine million, three hundred ninety-five thousand, six hundred forty-five".