73816711621 has 4 divisors (see below), whose sum is σ = 76362115500. Its totient is φ = 71271307744.

The previous prime is 73816711601. The next prime is 73816711627. The reversal of 73816711621 is 12611761837.

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 15646507396 + 58170204225 = 125086^2 + 241185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73816711621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73816711627) 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, 1272701896 + ... + 1272701953.

It is an arithmetic number, because the mean of its divisors is an integer number (19090528875).

Almost surely, 2^73816711621 is an apocalyptic number.

It is an amenable number.

73816711621 is a deficient number, since it is larger than the sum of its proper divisors (2545403879).

73816711621 is a wasteful number, since it uses less digits than its factorization.

73816711621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545403878.

The product of its digits is 84672, while the sum is 43.

The spelling of 73816711621 in words is "seventy-three billion, eight hundred sixteen million, seven hundred eleven thousand, six hundred twenty-one".