12717692145 has 20 divisors (see below), whose sum is σ = 22797641460. Its totient is φ = 6782768928.

The previous prime is 12717692111. The next prime is 12717692147. The reversal of 12717692145 is 54129671721.

It can be written as a sum of positive squares in 2 ways, for example, as 10008801936 + 2708890209 = 100044^2 + 52047^2 .

It is not a de Polignac number, because 12717692145 - 2⁶ = 12717692081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 12717692145.

It is not an unprimeable number, because it can be changed into a prime (12717692147) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15700450 + ... + 15701259.

It is an arithmetic number, because the mean of its divisors is an integer number (1139882073).

Almost surely, 2^12717692145 is an apocalyptic number.

12717692145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12717692145 is a deficient number, since it is larger than the sum of its proper divisors (10079949315).

12717692145 is an equidigital number, since it uses as much as digits as its factorization.

12717692145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31401726 (or 31401717 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The spelling of 12717692145 in words is "twelve billion, seven hundred seventeen million, six hundred ninety-two thousand, one hundred forty-five".