766660157 has 4 divisors (see below), whose sum is σ = 767121180. Its totient is φ = 766199136.

The previous prime is 766660133. The next prime is 766660177. The reversal of 766660157 is 751066667.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 637360516 + 129299641 = 25246^2 + 11371^2 .

It is a cyclic number.

It is not a de Polignac number, because 766660157 - 2²⁴ = 749882941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766660177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228008 + ... + 231345.

It is an arithmetic number, because the mean of its divisors is an integer number (191780295).

Almost surely, 2^766660157 is an apocalyptic number.

It is an amenable number.

766660157 is a deficient number, since it is larger than the sum of its proper divisors (461023).

766660157 is a wasteful number, since it uses less digits than its factorization.

766660157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461022.

The product of its (nonzero) digits is 317520, while the sum is 44.

The square root of 766660157 is about 27688.6286587111. The cubic root of 766660157 is about 915.2385363540.

The spelling of 766660157 in words is "seven hundred sixty-six million, six hundred sixty thousand, one hundred fifty-seven".