74168530921 has 9 divisors (see below), whose sum is σ = 76822437783. Its totient is φ = 71603369880.

The previous prime is 74168530889. The next prime is 74168530927. The reversal of 74168530921 is 12903586147.

The square root of 74168530921 is 272339.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 38892178521 + 35276352400 = 197211^2 + 187820^2 .

It is not a de Polignac number, because 74168530921 - 2⁵ = 74168530889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74168530927) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7893136 + ... + 7902526.

It is a 1-persistent number, because it is pandigital, but 2⋅74168530921 = 148337061842 is not.

Almost surely, 2^74168530921 is an apocalyptic number.

74168530921 is the 272339-th square number.

74168530921 is the 136170-th centered octagonal number.

It is an amenable number.

74168530921 is a deficient number, since it is larger than the sum of its proper divisors (2653906862).

74168530921 is an frugal number, since it uses more digits than its factorization.

74168530921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18840 (or 9420 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 74168530921 in words is "seventy-four billion, one hundred sixty-eight million, five hundred thirty thousand, nine hundred twenty-one".