73365734778857 has 8 divisors (see below), whose sum is σ = 73464579785160. Its totient is φ = 73266945701760.

The previous prime is 73365734778829. The next prime is 73365734778881. The reversal of 73365734778857 is 75887743756337.

It can be written as a sum of positive squares in 4 ways, for example, as 21181018016656 + 52184716762201 = 4602284^2 + 7223899^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 73365734778857 - 2²⁰ = 73365733730281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73365734778257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11356682 + ... + 16604387.

It is an arithmetic number, because the mean of its divisors is an integer number (9183072473145).

Almost surely, 2^{73365734778857} is an apocalyptic number.

It is an amenable number.

73365734778857 is a deficient number, since it is larger than the sum of its proper divisors (98845006303).

73365734778857 is a wasteful number, since it uses less digits than its factorization.

73365734778857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27964603.

The product of its digits is 17425497600, while the sum is 80.

The spelling of 73365734778857 in words is "seventy-three trillion, three hundred sixty-five billion, seven hundred thirty-four million, seven hundred seventy-eight thousand, eight hundred fifty-seven".