666261662037402 has 32 divisors (see below), whose sum is σ = 1374582416076864. Its totient is φ = 215186051836800.

The previous prime is 666261662037401. The next prime is 666261662037407. The reversal of 666261662037402 is 204730266162666.

It is not an unprimeable number, because it can be changed into a prime (666261662037401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13584953499 + ... + 13585002542.

It is an arithmetic number, because the mean of its divisors is an integer number (42955700502402).

Almost surely, 2^{666261662037402} is an apocalyptic number.

666261662037402 is an abundant number, since it is smaller than the sum of its proper divisors (708320754039462).

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

666261662037402 is a wasteful number, since it uses less digits than its factorization.

666261662037402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27169956174.

The product of its (nonzero) digits is 31352832, while the sum is 57.

The spelling of 666261662037402 in words is "six hundred sixty-six trillion, two hundred sixty-one billion, six hundred sixty-two million, thirty-seven thousand, four hundred two".