669117157 has 4 divisors (see below), whose sum is σ = 671586496. Its totient is φ = 666647820.

The previous prime is 669117151. The next prime is 669117181. The reversal of 669117157 is 751711966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 751711966 = 2 ⋅375855983.

It is a cyclic number.

It is not a de Polignac number, because 669117157 - 2¹⁵ = 669084389 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 (669117151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1234263 + ... + 1234804.

It is an arithmetic number, because the mean of its divisors is an integer number (167896624).

Almost surely, 2^669117157 is an apocalyptic number.

It is an amenable number.

669117157 is a deficient number, since it is larger than the sum of its proper divisors (2469339).

669117157 is a wasteful number, since it uses less digits than its factorization.

669117157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469338.

The product of its digits is 79380, while the sum is 43.

The square root of 669117157 is about 25867.2989892644. The cubic root of 669117157 is about 874.6495062085.

The spelling of 669117157 in words is "six hundred sixty-nine million, one hundred seventeen thousand, one hundred fifty-seven".