7640613817 has 2 divisors, whose sum is σ = 7640613818. Its totient is φ = 7640613816.

The previous prime is 7640613791. The next prime is 7640613829. The reversal of 7640613817 is 7183160467.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7266539536 + 374074281 = 85244^2 + 19341^2 .

It is a cyclic number.

It is not a de Polignac number, because 7640613817 - 2²⁷ = 7506396089 is a prime.

It is not a weakly prime, because it can be changed into another prime (7640613517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3820306908 + 3820306909.

It is an arithmetic number, because the mean of its divisors is an integer number (3820306909).

Almost surely, 2^7640613817 is an apocalyptic number.

It is an amenable number.

7640613817 is a deficient number, since it is larger than the sum of its proper divisors (1).

7640613817 is an equidigital number, since it uses as much as digits as its factorization.

7640613817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 7640613817 is about 87410.6047170479. The cubic root of 7640613817 is about 1969.5911454509.

The spelling of 7640613817 in words is "seven billion, six hundred forty million, six hundred thirteen thousand, eight hundred seventeen".