666111736018280 has 32 divisors (see below), whose sum is σ = 1503570542423040. Its totient is φ = 265587959050560.

The previous prime is 666111736018273. The next prime is 666111736018291. The reversal of 666111736018280 is 82810637111666.

It is a happy number.

It is a super-2 number, since 2×666111736018280² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26772967304 + ... + 26772992183.

It is an arithmetic number, because the mean of its divisors is an integer number (46986579450720).

Almost surely, 2^{666111736018280} is an apocalyptic number.

It is an amenable number.

666111736018280 is an abundant number, since it is smaller than the sum of its proper divisors (837458806404760).

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

666111736018280 is a wasteful number, since it uses less digits than its factorization.

666111736018280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53545959809 (or 53545959805 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 666111736018280 in words is "six hundred sixty-six trillion, one hundred eleven billion, seven hundred thirty-six million, eighteen thousand, two hundred eighty".