66649877894666 has 48 divisors (see below), whose sum is σ = 110254381070400. Its totient is φ = 30194943271680.

The previous prime is 66649877894647. The next prime is 66649877894741.

66649877894666 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163909481 + ... + 164315603.

It is an arithmetic number, because the mean of its divisors is an integer number (2296966272300).

Almost surely, 2^{66649877894666} is an apocalyptic number.

66649877894666 is a deficient number, since it is larger than the sum of its proper divisors (43604503175734).

66649877894666 is a wasteful number, since it uses less digits than its factorization.

66649877894666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408395 (or 408384 counting only the distinct ones).

The product of its digits is 189621927936, while the sum is 92.

The spelling of 66649877894666 in words is "sixty-six trillion, six hundred forty-nine billion, eight hundred seventy-seven million, eight hundred ninety-four thousand, six hundred sixty-six".