7656311921864 has 16 divisors (see below), whose sum is σ = 14355621199500. Its totient is φ = 3828146268672.

The previous prime is 7656311921849. The next prime is 7656311921893. The reversal of 7656311921864 is 4681291136567.

It can be written as a sum of positive squares in 2 ways, for example, as 7642515540100 + 13796381764 = 2764510^2 + 117458^2 .

It is a super-2 number, since 2×7656311921864² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3011684 + ... + 4937900.

Almost surely, 2^{7656311921864} is an apocalyptic number.

It is an amenable number.

7656311921864 is a deficient number, since it is larger than the sum of its proper divisors (6699309277636).

7656311921864 is a wasteful number, since it uses less digits than its factorization.

7656311921864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423072 (or 2423068 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 59.

The spelling of 7656311921864 in words is "seven trillion, six hundred fifty-six billion, three hundred eleven million, nine hundred twenty-one thousand, eight hundred sixty-four".