73321521128 has 8 divisors (see below), whose sum is σ = 137477852130. Its totient is φ = 36660760560.

The previous prime is 73321521109. The next prime is 73321521209. The reversal of 73321521128 is 82112512337.

It can be written as a sum of positive squares in only one way, i.e., 72996151684 + 325369444 = 270178^2 + 18038^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4582595063 + ... + 4582595078.

Almost surely, 2^73321521128 is an apocalyptic number.

It is an amenable number.

73321521128 is a deficient number, since it is larger than the sum of its proper divisors (64156331002).

73321521128 is a wasteful number, since it uses less digits than its factorization.

73321521128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9165190147 (or 9165190143 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The spelling of 73321521128 in words is "seventy-three billion, three hundred twenty-one million, five hundred twenty-one thousand, one hundred twenty-eight".