666768043818 has 32 divisors (see below), whose sum is σ = 1481763741120. Its totient is φ = 222247468080.

The previous prime is 666768043801. The next prime is 666768043847. The reversal of 666768043818 is 818340867666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1267396 + ... + 1714592.

It is an arithmetic number, because the mean of its divisors is an integer number (46305116910).

Almost surely, 2^666768043818 is an apocalyptic number.

666768043818 is an abundant number, since it is smaller than the sum of its proper divisors (814995697302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666768043818 is a wasteful number, since it uses less digits than its factorization.

666768043818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474819 (or 474813 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 63.

The spelling of 666768043818 in words is "six hundred sixty-six billion, seven hundred sixty-eight million, forty-three thousand, eight hundred eighteen".