615968069 has 2 divisors, whose sum is σ = 615968070. Its totient is φ = 615968068.

The previous prime is 615968039. The next prime is 615968071. The reversal of 615968069 is 960869516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 539632900 + 76335169 = 23230^2 + 8737^2 .

It is a cyclic number.

It is not a de Polignac number, because 615968069 - 2²⁰ = 614919493 is a prime.

It is a super-2 number, since 2×615968069² = 758833324055177522, which contains 22 as substring.

Together with 615968071, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (615968039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307984034 + 307984035.

It is an arithmetic number, because the mean of its divisors is an integer number (307984035).

Almost surely, 2^615968069 is an apocalyptic number.

It is an amenable number.

615968069 is a deficient number, since it is larger than the sum of its proper divisors (1).

615968069 is an equidigital number, since it uses as much as digits as its factorization.

615968069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 615968069 is about 24818.7040153188. The cubic root of 615968069 is about 850.8494709595.

The spelling of 615968069 in words is "six hundred fifteen million, nine hundred sixty-eight thousand, sixty-nine".