66415022861 has 8 divisors (see below), whose sum is σ = 76266055200. Its totient is φ = 57199541040.

The previous prime is 66415022857. The next prime is 66415022881. The reversal of 66415022861 is 16822051466.

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

It is not a de Polignac number, because 66415022861 - 2² = 66415022857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66415022881) 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, 158887406 + ... + 158887823.

It is an arithmetic number, because the mean of its divisors is an integer number (9533256900).

Almost surely, 2^66415022861 is an apocalyptic number.

It is an amenable number.

66415022861 is a deficient number, since it is larger than the sum of its proper divisors (9851032339).

66415022861 is a wasteful number, since it uses less digits than its factorization.

66415022861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317775259.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 66415022861 in words is "sixty-six billion, four hundred fifteen million, twenty-two thousand, eight hundred sixty-one".