66516717156 has 24 divisors (see below), whose sum is σ = 164335419360. Its totient is φ = 20867989632.

The previous prime is 66516717121. The next prime is 66516717161. The reversal of 66516717156 is 65171761566.

It is a super-2 number, since 2×66516717156² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 66516717099 and 66516717108.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163030966 + ... + 163031373.

It is an arithmetic number, because the mean of its divisors is an integer number (6847309140).

Almost surely, 2^66516717156 is an apocalyptic number.

It is an amenable number.

66516717156 is an abundant number, since it is smaller than the sum of its proper divisors (97818702204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66516717156 is a wasteful number, since it uses less digits than its factorization.

66516717156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326062363 (or 326062361 counting only the distinct ones).

The product of its digits is 1587600, while the sum is 51.

The spelling of 66516717156 in words is "sixty-six billion, five hundred sixteen million, seven hundred seventeen thousand, one hundred fifty-six".