166657557 has 16 divisors (see below), whose sum is σ = 243906048. Its totient is φ = 100381680.

The previous prime is 166657553. The next prime is 166657567. The reversal of 166657557 is 755756661.

It is not a de Polignac number, because 166657557 - 2² = 166657553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166657553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10113 + ... + 20870.

It is an arithmetic number, because the mean of its divisors is an integer number (15244128).

Almost surely, 2^166657557 is an apocalyptic number.

It is an amenable number.

166657557 is a deficient number, since it is larger than the sum of its proper divisors (77248491).

166657557 is a wasteful number, since it uses less digits than its factorization.

166657557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31160.

The product of its digits is 1323000, while the sum is 48.

The square root of 166657557 is about 12909.5916666640. The cubic root of 166657557 is about 550.3111814809.

The spelling of 166657557 in words is "one hundred sixty-six million, six hundred fifty-seven thousand, five hundred fifty-seven".