73661661765 has 32 divisors (see below), whose sum is σ = 131738261760. Its totient is φ = 39050960832.

The previous prime is 73661661739. The next prime is 73661661779. The reversal of 73661661765 is 56716616637.

73661661765 is a `hidden beast` number, since 7 + 3 + 6 + 6 + 16 + 617 + 6 + 5 = 666.

It is not a de Polignac number, because 73661661765 - 2⁶ = 73661661701 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1611114 + ... + 1656203.

It is an arithmetic number, because the mean of its divisors is an integer number (4116820680).

Almost surely, 2^73661661765 is an apocalyptic number.

It is an amenable number.

73661661765 is a deficient number, since it is larger than the sum of its proper divisors (58076599995).

73661661765 is a wasteful number, since it uses less digits than its factorization.

73661661765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3267498 (or 3267492 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 54.

The spelling of 73661661765 in words is "seventy-three billion, six hundred sixty-one million, six hundred sixty-one thousand, seven hundred sixty-five".