768805157 has 2 divisors, whose sum is σ = 768805158. Its totient is φ = 768805156.

The previous prime is 768805117. The next prime is 768805171. The reversal of 768805157 is 751508867.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 737991556 + 30813601 = 27166^2 + 5551^2 .

It is a cyclic number.

It is not a de Polignac number, because 768805157 - 2²⁰ = 767756581 is a prime.

It is a super-2 number, since 2×768805157² = 1182122738859589298, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (768805117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384402578 + 384402579.

It is an arithmetic number, because the mean of its divisors is an integer number (384402579).

Almost surely, 2^768805157 is an apocalyptic number.

It is an amenable number.

768805157 is a deficient number, since it is larger than the sum of its proper divisors (1).

768805157 is an equidigital number, since it uses as much as digits as its factorization.

768805157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 470400, while the sum is 47.

The square root of 768805157 is about 27727.3359160234. The cubic root of 768805157 is about 916.0913082038.

The spelling of 768805157 in words is "seven hundred sixty-eight million, eight hundred five thousand, one hundred fifty-seven".