666140615745994 has 8 divisors (see below), whose sum is σ = 999215955766980. Its totient is φ = 333068630490336.

The previous prime is 666140615745961. The next prime is 666140615746007. The reversal of 666140615745994 is 499547516041666.

It can be written as a sum of positive squares in 2 ways, for example, as 666097512588225 + 43103157769 = 25808865^2 + 207613^2 .

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, 838194859 + ... + 838989214.

Almost surely, 2^{666140615745994} is an apocalyptic number.

666140615745994 is a deficient number, since it is larger than the sum of its proper divisors (333075340020986).

666140615745994 is a wasteful number, since it uses less digits than its factorization.

666140615745994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677382664.

The product of its (nonzero) digits is 1175731200, while the sum is 73.

The spelling of 666140615745994 in words is "six hundred sixty-six trillion, one hundred forty billion, six hundred fifteen million, seven hundred forty-five thousand, nine hundred ninety-four".