66650413760512 has 64 divisors (see below), whose sum is σ = 139094394802560. Its totient is φ = 31876284481536.

The previous prime is 66650413760353. The next prime is 66650413760543. The reversal of 66650413760512 is 21506731405666.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×66650413760512² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66650413760512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43463928 + ... + 44971255.

It is an arithmetic number, because the mean of its divisors is an integer number (2173349918790).

Almost surely, 2^{66650413760512} is an apocalyptic number.

It is an amenable number.

66650413760512 is an abundant number, since it is smaller than the sum of its proper divisors (72443981042048).

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

66650413760512 is an frugal number, since it uses more digits than its factorization.

66650413760512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88435236 (or 88435208 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 52.

The spelling of 66650413760512 in words is "sixty-six trillion, six hundred fifty billion, four hundred thirteen million, seven hundred sixty thousand, five hundred twelve".