166820472023 has 32 divisors (see below), whose sum is σ = 181959478272. Its totient is φ = 152530963200.

The previous prime is 166820471947. The next prime is 166820472053. The reversal of 166820472023 is 320274028661.

It is a cyclic number.

It is not a de Polignac number, because 166820472023 - 2⁸ = 166820471767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166820472053) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9611333 + ... + 9628673.

It is an arithmetic number, because the mean of its divisors is an integer number (5686233696).

Almost surely, 2^166820472023 is an apocalyptic number.

166820472023 is a deficient number, since it is larger than the sum of its proper divisors (15139006249).

166820472023 is a wasteful number, since it uses less digits than its factorization.

166820472023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17615.

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 166820472023 in words is "one hundred sixty-six billion, eight hundred twenty million, four hundred seventy-two thousand, twenty-three".