66517222057 has 24 divisors (see below), whose sum is σ = 78929222400. Its totient is φ = 55264776000.

The previous prime is 66517222033. The next prime is 66517222069. The reversal of 66517222057 is 75022271566.

It is not a de Polignac number, because 66517222057 - 2¹⁵ = 66517189289 is a prime.

It is a super-2 number, since 2×66517222057² (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 (66517222007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1435944 + ... + 1481542.

It is an arithmetic number, because the mean of its divisors is an integer number (3288717600).

Almost surely, 2^66517222057 is an apocalyptic number.

It is an amenable number.

66517222057 is a deficient number, since it is larger than the sum of its proper divisors (12412000343).

66517222057 is a wasteful number, since it uses less digits than its factorization.

66517222057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45825 (or 45724 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 66517222057 in words is "sixty-six billion, five hundred seventeen million, two hundred twenty-two thousand, fifty-seven".