7911864641 has 2 divisors, whose sum is σ = 7911864642. Its totient is φ = 7911864640.

The previous prime is 7911864629. The next prime is 7911864703. The reversal of 7911864641 is 1464681197.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4454895025 + 3456969616 = 66745^2 + 58796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7911864641 is a prime.

It is not a weakly prime, because it can be changed into another prime (7911864601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3955932320 + 3955932321.

It is an arithmetic number, because the mean of its divisors is an integer number (3955932321).

Almost surely, 2^7911864641 is an apocalyptic number.

It is an amenable number.

7911864641 is a deficient number, since it is larger than the sum of its proper divisors (1).

7911864641 is an equidigital number, since it uses as much as digits as its factorization.

7911864641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 7911864641 is about 88948.6629522895. The cubic root of 7911864641 is about 1992.6282487754.

The spelling of 7911864641 in words is "seven billion, nine hundred eleven million, eight hundred sixty-four thousand, six hundred forty-one".