66107817913 has 4 divisors (see below), whose sum is σ = 66143002240. Its totient is φ = 66072633588.

The previous prime is 66107817911. The next prime is 66107817943. The reversal of 66107817913 is 31971870166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66107817913 - 2¹ = 66107817911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66107817911) 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, 17589345 + ... + 17593102.

It is an arithmetic number, because the mean of its divisors is an integer number (16535750560).

Almost surely, 2^66107817913 is an apocalyptic number.

It is an amenable number.

66107817913 is a deficient number, since it is larger than the sum of its proper divisors (35184327).

66107817913 is a wasteful number, since it uses less digits than its factorization.

66107817913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35184326.

The product of its (nonzero) digits is 381024, while the sum is 49.

The spelling of 66107817913 in words is "sixty-six billion, one hundred seven million, eight hundred seventeen thousand, nine hundred thirteen".