166630557 has 8 divisors (see below), whose sum is σ = 226901376. Its totient is φ = 108723392.

The previous prime is 166630553. The next prime is 166630567. The reversal of 166630557 is 755036661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166630557 - 2² = 166630553 is a prime.

It is a super-2 number, since 2×166630557² = 55531485052260498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166630553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590748 + ... + 591029.

It is an arithmetic number, because the mean of its divisors is an integer number (28362672).

Almost surely, 2^166630557 is an apocalyptic number.

It is an amenable number.

166630557 is a deficient number, since it is larger than the sum of its proper divisors (60270819).

166630557 is a wasteful number, since it uses less digits than its factorization.

166630557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181827.

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 166630557 is about 12908.5458902233. The cubic root of 166630557 is about 550.2814614477.

It can be divided in two parts, 1666 and 30557, that added together give a palindrome (32223).

The spelling of 166630557 in words is "one hundred sixty-six million, six hundred thirty thousand, five hundred fifty-seven".