66649633694666 has 64 divisors (see below), whose sum is σ = 115360341626880. Its totient is φ = 28561607562240.

The previous prime is 66649633694603. The next prime is 66649633694711.

66649633694666 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256488281 + ... + 256748003.

It is an arithmetic number, because the mean of its divisors is an integer number (1802505337920).

Almost surely, 2^{66649633694666} is an apocalyptic number.

66649633694666 is a deficient number, since it is larger than the sum of its proper divisors (48710707932214).

66649633694666 is a wasteful number, since it uses less digits than its factorization.

66649633694666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262731.

The product of its digits is 19591041024, while the sum is 80.

The spelling of 66649633694666 in words is "sixty-six trillion, six hundred forty-nine billion, six hundred thirty-three million, six hundred ninety-four thousand, six hundred sixty-six".