73818853970661 has 20 divisors (see below), whose sum is σ = 110273478822892. Its totient is φ = 49212181136448.

The previous prime is 73818853970627. The next prime is 73818853970723. The reversal of 73818853970661 is 16607935881837.

73818853970661 is a `hidden beast` number, since 7 + 3 + 8 + 1 + 88 + 539 + 7 + 0 + 6 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20545423682436 + 53273430288225 = 4532706^2 + 7298865^2 .

It is not a de Polignac number, because 73818853970661 - 2⁹ = 73818853970149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73818853970661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73818853970761) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6927171 + ... + 13986543.

Almost surely, 2^{73818853970661} is an apocalyptic number.

It is an amenable number.

73818853970661 is a deficient number, since it is larger than the sum of its proper divisors (36454624852231).

73818853970661 is a wasteful number, since it uses less digits than its factorization.

73818853970661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7188482 (or 7188473 counting only the distinct ones).

The product of its (nonzero) digits is 365783040, while the sum is 72.

The spelling of 73818853970661 in words is "seventy-three trillion, eight hundred eighteen billion, eight hundred fifty-three million, nine hundred seventy thousand, six hundred sixty-one".