66415022859 has 4 divisors (see below), whose sum is σ = 88553363816. Its totient is φ = 44276681904.

The previous prime is 66415022857. The next prime is 66415022881. The reversal of 66415022859 is 95822051466.

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

It is not a de Polignac number, because 66415022859 - 2¹ = 66415022857 is a prime.

It is a super-2 number, since 2×66415022859² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66415022857) 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, 11069170474 + ... + 11069170479.

It is an arithmetic number, because the mean of its divisors is an integer number (22138340954).

Almost surely, 2^66415022859 is an apocalyptic number.

66415022859 is a deficient number, since it is larger than the sum of its proper divisors (22138340957).

66415022859 is a wasteful number, since it uses less digits than its factorization.

66415022859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22138340956.

The product of its (nonzero) digits is 1036800, while the sum is 48.

The spelling of 66415022859 in words is "sixty-six billion, four hundred fifteen million, twenty-two thousand, eight hundred fifty-nine".