66566612352 has 64 divisors (see below), whose sum is σ = 176858440560. Its totient is φ = 22183741440.

The previous prime is 66566612317. The next prime is 66566612363. The reversal of 66566612352 is 25321666566.

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

It is a super-2 number, since 2×66566612352² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 1876702 + ... + 1911842.

Almost surely, 2^66566612352 is an apocalyptic number.

It is an amenable number.

66566612352 is an abundant number, since it is smaller than the sum of its proper divisors (110291828208).

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

66566612352 is a wasteful number, since it uses less digits than its factorization.

66566612352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40091 (or 40079 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 48.

The spelling of 66566612352 in words is "sixty-six billion, five hundred sixty-six million, six hundred twelve thousand, three hundred fifty-two".