666261756016008 has 32 divisors (see below), whose sum is σ = 1668030501908160. Its totient is φ = 221770437089600.

The previous prime is 666261756015991. The next prime is 666261756016009. The reversal of 666261756016008 is 800610657162666.

It is not an unprimeable number, because it can be changed into a prime (666261756016009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19800915060 + ... + 19800948707.

It is an arithmetic number, because the mean of its divisors is an integer number (52125953184630).

Almost surely, 2^{666261756016008} is an apocalyptic number.

It is an amenable number.

666261756016008 is an abundant number, since it is smaller than the sum of its proper divisors (1001768745892152).

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

666261756016008 is a wasteful number, since it uses less digits than its factorization.

666261756016008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39601864477 (or 39601864473 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 60.

The spelling of 666261756016008 in words is "six hundred sixty-six trillion, two hundred sixty-one billion, seven hundred fifty-six million, sixteen thousand, eight".