666266246020 has 12 divisors (see below), whose sum is σ = 1399159116684. Its totient is φ = 266506498400.

The previous prime is 666266245999. The next prime is 666266246029. The reversal of 666266246020 is 20642662666.

It can be written as a sum of positive squares in 2 ways, for example, as 359119738756 + 307146507264 = 599266^2 + 554208^2 .

It is not an unprimeable number, because it can be changed into a prime (666266246029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16656656131 + ... + 16656656170.

It is an arithmetic number, because the mean of its divisors is an integer number (116596593057).

Almost surely, 2^666266246020 is an apocalyptic number.

It is an amenable number.

666266246020 is an abundant number, since it is smaller than the sum of its proper divisors (732892870664).

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

666266246020 is a wasteful number, since it uses less digits than its factorization.

666266246020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33313312310 (or 33313312308 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 46.

The spelling of 666266246020 in words is "six hundred sixty-six billion, two hundred sixty-six million, two hundred forty-six thousand, twenty".