666662741705456 has 10 divisors (see below), whose sum is σ = 1291659062054352. Its totient is φ = 333331370852720.

The previous prime is 666662741705431. The next prime is 666662741705533. The reversal of 666662741705456 is 654507147266666.

666662741705456 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×666662741705456² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666662741705456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20833210678280 + ... + 20833210678311.

Almost surely, 2^{666662741705456} is an apocalyptic number.

It is an amenable number.

666662741705456 is a deficient number, since it is larger than the sum of its proper divisors (624996320348896).

666662741705456 is a wasteful number, since it uses less digits than its factorization.

666662741705456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41666421356599 (or 41666421356593 counting only the distinct ones).

The product of its (nonzero) digits is 1828915200, while the sum is 71.

The spelling of 666662741705456 in words is "six hundred sixty-six trillion, six hundred sixty-two billion, seven hundred forty-one million, seven hundred five thousand, four hundred fifty-six".