166530639 has 8 divisors (see below), whose sum is σ = 242226432. Its totient is φ = 100927640.

The previous prime is 166530631. The next prime is 166530641. The reversal of 166530639 is 936035661.

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

It is not a de Polignac number, because 166530639 - 2³ = 166530631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166530597 and 166530606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166530631) 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, 2523159 + ... + 2523224.

It is an arithmetic number, because the mean of its divisors is an integer number (30278304).

Almost surely, 2^166530639 is an apocalyptic number.

166530639 is a deficient number, since it is larger than the sum of its proper divisors (75695793).

166530639 is a wasteful number, since it uses less digits than its factorization.

166530639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5046397.

The product of its (nonzero) digits is 87480, while the sum is 39.

The square root of 166530639 is about 12904.6750830852. The cubic root of 166530639 is about 550.1714495794.

The spelling of 166530639 in words is "one hundred sixty-six million, five hundred thirty thousand, six hundred thirty-nine".