666740618794 has 8 divisors (see below), whose sum is σ = 1003644889920. Its totient is φ = 332192322156.

The previous prime is 666740618759. The next prime is 666740618821. The reversal of 666740618794 is 497816047666.

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, 588992914 + ... + 588994045.

It is an arithmetic number, because the mean of its divisors is an integer number (125455611240).

Almost surely, 2^666740618794 is an apocalyptic number.

666740618794 is a deficient number, since it is larger than the sum of its proper divisors (336904271126).

666740618794 is a wasteful number, since it uses less digits than its factorization.

666740618794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177987244.

The product of its (nonzero) digits is 73156608, while the sum is 64.

The spelling of 666740618794 in words is "six hundred sixty-six billion, seven hundred forty million, six hundred eighteen thousand, seven hundred ninety-four".