66394987112 has 8 divisors (see below), whose sum is σ = 124490600850. Its totient is φ = 33197493552.

The previous prime is 66394987103. The next prime is 66394987123. The reversal of 66394987112 is 21178949366.

It can be written as a sum of positive squares in only one way, i.e., 66241375876 + 153611236 = 257374^2 + 12394^2 .

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

It is a super-2 number, since 2×66394987112² (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, 4149686687 + ... + 4149686702.

Almost surely, 2^66394987112 is an apocalyptic number.

It is an amenable number.

66394987112 is a deficient number, since it is larger than the sum of its proper divisors (58095613738).

66394987112 is a wasteful number, since it uses less digits than its factorization.

66394987112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8299373395 (or 8299373391 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 56.

The spelling of 66394987112 in words is "sixty-six billion, three hundred ninety-four million, nine hundred eighty-seven thousand, one hundred twelve".