12947831965 has 8 divisors (see below), whose sum is σ = 15538338648. Its totient is φ = 10357638720.

The previous prime is 12947831947. The next prime is 12947831971. The reversal of 12947831965 is 56913874921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5636555929 + 7311276036 = 75077^2 + 85506^2 .

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

It is not a de Polignac number, because 12947831965 - 2¹³ = 12947823773 is a prime.

It is a super-2 number, since 2×12947831965² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24895 + ... + 162835.

It is an arithmetic number, because the mean of its divisors is an integer number (1942292331).

Almost surely, 2^12947831965 is an apocalyptic number.

It is an amenable number.

12947831965 is a deficient number, since it is larger than the sum of its proper divisors (2590506683).

12947831965 is a wasteful number, since it uses less digits than its factorization.

12947831965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156719.

The product of its digits is 3265920, while the sum is 55.

The spelling of 12947831965 in words is "twelve billion, nine hundred forty-seven million, eight hundred thirty-one thousand, nine hundred sixty-five".