166520623 has 8 divisors (see below), whose sum is σ = 173151360. Its totient is φ = 159968640.

The previous prime is 166520603. The next prime is 166520663. The reversal of 166520623 is 326025661.

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 166520623 - 2⁵ = 166520591 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166520603) 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, 15358 + ... + 23851.

It is an arithmetic number, because the mean of its divisors is an integer number (21643920).

Almost surely, 2^166520623 is an apocalyptic number.

166520623 is a deficient number, since it is larger than the sum of its proper divisors (6630737).

166520623 is a wasteful number, since it uses less digits than its factorization.

166520623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39377.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 166520623 is about 12904.2870008381. The cubic root of 166520623 is about 550.1604193214.

The spelling of 166520623 in words is "one hundred sixty-six million, five hundred twenty thousand, six hundred twenty-three".