66794666674 has 4 divisors (see below), whose sum is σ = 100192000014. Its totient is φ = 33397333336.

The previous prime is 66794666623. The next prime is 66794666681. The reversal of 66794666674 is 47666649766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 54660102025 + 12134564649 = 233795^2 + 110157^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16698666667 + ... + 16698666670.

Almost surely, 2^66794666674 is an apocalyptic number.

66794666674 is a deficient number, since it is larger than the sum of its proper divisors (33397333340).

66794666674 is a wasteful number, since it uses less digits than its factorization.

66794666674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33397333339.

The product of its digits is 329204736, while the sum is 67.

The spelling of 66794666674 in words is "sixty-six billion, seven hundred ninety-four million, six hundred sixty-six thousand, six hundred seventy-four".