666463974394 has 8 divisors (see below), whose sum is σ = 1016639961120. Its totient is φ = 327583987356.

The previous prime is 666463974347. The next prime is 666463974403. The reversal of 666463974394 is 493479364666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2823999774 + ... + 2824000009.

It is an arithmetic number, because the mean of its divisors is an integer number (127079995140).

Almost surely, 2^666463974394 is an apocalyptic number.

666463974394 is a deficient number, since it is larger than the sum of its proper divisors (350175986726).

666463974394 is a wasteful number, since it uses less digits than its factorization.

666463974394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5647999844.

The product of its digits is 423263232, while the sum is 67.

The spelling of 666463974394 in words is "six hundred sixty-six billion, four hundred sixty-three million, nine hundred seventy-four thousand, three hundred ninety-four".