312669556706621 has 4 divisors (see below), whose sum is σ = 314046955635072. Its totient is φ = 311292157778172.

The previous prime is 312669556706537. The next prime is 312669556706671. The reversal of 312669556706621 is 126607655966213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312669556706621 is a prime.

It is a super-2 number, since 2×312669556706621² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312669556706671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688699463885 + ... + 688699464338.

It is an arithmetic number, because the mean of its divisors is an integer number (78511738908768).

Almost surely, 2^{312669556706621} is an apocalyptic number.

It is an amenable number.

312669556706621 is a deficient number, since it is larger than the sum of its proper divisors (1377398928451).

312669556706621 is a wasteful number, since it uses less digits than its factorization.

312669556706621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377398928450.

The product of its (nonzero) digits is 146966400, while the sum is 65.

The spelling of 312669556706621 in words is "three hundred twelve trillion, six hundred sixty-nine billion, five hundred fifty-six million, seven hundred six thousand, six hundred twenty-one".