666570157 has 4 divisors (see below), whose sum is σ = 727167456. Its totient is φ = 605972860.

The previous prime is 666570143. The next prime is 666570167. The reversal of 666570157 is 751075666.

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.

It is a cyclic number.

It is not a de Polignac number, because 666570157 - 2¹⁹ = 666045869 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 (666570127) 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, 30298633 + ... + 30298654.

It is an arithmetic number, because the mean of its divisors is an integer number (181791864).

Almost surely, 2^666570157 is an apocalyptic number.

It is an amenable number.

666570157 is a deficient number, since it is larger than the sum of its proper divisors (60597299).

666570157 is a wasteful number, since it uses less digits than its factorization.

666570157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60597298.

The product of its (nonzero) digits is 264600, while the sum is 43.

The square root of 666570157 is about 25818.0200054148. The cubic root of 666570157 is about 873.5383082222.

The spelling of 666570157 in words is "six hundred sixty-six million, five hundred seventy thousand, one hundred fifty-seven".