66664323112 has 8 divisors (see below), whose sum is σ = 124995605850. Its totient is φ = 33332161552.

The previous prime is 66664323097. The next prime is 66664323139. The reversal of 66664323112 is 21132346666.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 66664141636 + 181476 = 258194^2 + 426^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×66664323112² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4166520187 + ... + 4166520202.

Almost surely, 2^66664323112 is an apocalyptic number.

It is an amenable number.

66664323112 is a deficient number, since it is larger than the sum of its proper divisors (58331282738).

66664323112 is a wasteful number, since it uses less digits than its factorization.

66664323112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8333040395 (or 8333040391 counting only the distinct ones).

The product of its digits is 186624, while the sum is 40.

Adding to 66664323112 its reverse (21132346666), we get a palindrome (87796669778).

The spelling of 66664323112 in words is "sixty-six billion, six hundred sixty-four million, three hundred twenty-three thousand, one hundred twelve".