166473921 has 8 divisors (see below), whose sum is σ = 223248960. Its totient is φ = 110340752.

The previous prime is 166473893. The next prime is 166473929. The reversal of 166473921 is 129374661.

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 166473921 - 2⁹ = 166473409 is a prime.

It is a super-2 number, since 2×166473921² = 55427132746228482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166473921.

It is not an unprimeable number, because it can be changed into a prime (166473929) 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, 159861 + ... + 160898.

It is an arithmetic number, because the mean of its divisors is an integer number (27906120).

Almost surely, 2^166473921 is an apocalyptic number.

It is an amenable number.

166473921 is a deficient number, since it is larger than the sum of its proper divisors (56775039).

166473921 is a wasteful number, since it uses less digits than its factorization.

166473921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320935.

The product of its digits is 54432, while the sum is 39.

The square root of 166473921 is about 12902.4773202668. The cubic root of 166473921 is about 550.1089822605.

The spelling of 166473921 in words is "one hundred sixty-six million, four hundred seventy-three thousand, nine hundred twenty-one".