73158433921 has 4 divisors (see below), whose sum is σ = 73159634772. Its totient is φ = 73157233072.

The previous prime is 73158433903. The next prime is 73158433961. The reversal of 73158433921 is 12933485137.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68992376896 + 4166057025 = 262664^2 + 64545^2 .

It is a cyclic number.

It is not a de Polignac number, because 73158433921 - 2⁵ = 73158433889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73158433961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503866 + ... + 632611.

It is an arithmetic number, because the mean of its divisors is an integer number (18289908693).

Almost surely, 2^73158433921 is an apocalyptic number.

It is an amenable number.

73158433921 is a deficient number, since it is larger than the sum of its proper divisors (1200851).

73158433921 is a wasteful number, since it uses less digits than its factorization.

73158433921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200850.

The product of its digits is 544320, while the sum is 46.

The spelling of 73158433921 in words is "seventy-three billion, one hundred fifty-eight million, four hundred thirty-three thousand, nine hundred twenty-one".