66310781113079 has 4 divisors (see below), whose sum is σ = 67721648796384. Its totient is φ = 64899913429776.

The previous prime is 66310781113019. The next prime is 66310781113127. The reversal of 66310781113079 is 97031118701366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66310781113079 - 2³⁶ = 66242061636343 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 66310781113079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66310781113019) 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, 705433841582 + ... + 705433841675.

It is an arithmetic number, because the mean of its divisors is an integer number (16930412199096).

Almost surely, 2^{66310781113079} is an apocalyptic number.

66310781113079 is a deficient number, since it is larger than the sum of its proper divisors (1410867683305).

66310781113079 is a wasteful number, since it uses less digits than its factorization.

66310781113079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410867683304.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The spelling of 66310781113079 in words is "sixty-six trillion, three hundred ten billion, seven hundred eighty-one million, one hundred thirteen thousand, seventy-nine".