73661661764 has 12 divisors (see below), whose sum is σ = 129409497084. Its totient is φ = 36687519744.

The previous prime is 73661661739. The next prime is 73661661779. The reversal of 73661661764 is 46716616637.

It can be written as a sum of positive squares in 2 ways, for example, as 67350630400 + 6311031364 = 259520^2 + 79442^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35826629 + ... + 35828684.

It is an arithmetic number, because the mean of its divisors is an integer number (10784124757).

Almost surely, 2^73661661764 is an apocalyptic number.

It is an amenable number.

73661661764 is a deficient number, since it is larger than the sum of its proper divisors (55747835320).

73661661764 is a wasteful number, since it uses less digits than its factorization.

73661661764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71655574 (or 71655572 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 53.

The spelling of 73661661764 in words is "seventy-three billion, six hundred sixty-one million, six hundred sixty-one thousand, seven hundred sixty-four".