666943508742 has 32 divisors (see below), whose sum is σ = 1524651919872. Its totient is φ = 190529086464.

The previous prime is 666943508741. The next prime is 666943508761. The reversal of 666943508742 is 247805349666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666943508741) 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, 781618 + ... + 1394565.

It is an arithmetic number, because the mean of its divisors is an integer number (47645372496).

Almost surely, 2^666943508742 is an apocalyptic number.

666943508742 is an abundant number, since it is smaller than the sum of its proper divisors (857708411130).

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

666943508742 is a wasteful number, since it uses less digits than its factorization.

666943508742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2183492.

The product of its (nonzero) digits is 52254720, while the sum is 60.

The spelling of 666943508742 in words is "six hundred sixty-six billion, nine hundred forty-three million, five hundred eight thousand, seven hundred forty-two".