166733353521 has 48 divisors (see below), whose sum is σ = 291940746240. Its totient is φ = 89572560480.

The previous prime is 166733353489. The next prime is 166733353547. The reversal of 166733353521 is 125353337661.

166733353521 is a `hidden beast` number, since 1 + 6 + 6 + 73 + 3 + 3 + 53 + 521 = 666.

It is not a de Polignac number, because 166733353521 - 2⁵ = 166733353489 is a prime.

It is a super-2 number, since 2×166733353521² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166733333521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 374845 + ... + 688458.

It is an arithmetic number, because the mean of its divisors is an integer number (6082098880).

Almost surely, 2^166733353521 is an apocalyptic number.

It is an amenable number.

166733353521 is a deficient number, since it is larger than the sum of its proper divisors (125207392719).

166733353521 is a wasteful number, since it uses less digits than its factorization.

166733353521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063466 (or 1063463 counting only the distinct ones).

The product of its digits is 1020600, while the sum is 45.

The spelling of 166733353521 in words is "one hundred sixty-six billion, seven hundred thirty-three million, three hundred fifty-three thousand, five hundred twenty-one".