666240253364 has 24 divisors (see below), whose sum is σ = 1334847288768. Its totient is φ = 285024369600.

The previous prime is 666240253361. The next prime is 666240253379. The reversal of 666240253364 is 463352042666.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666240253361) 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, 21115937 + ... + 21147464.

It is an arithmetic number, because the mean of its divisors is an integer number (55618637032).

Almost surely, 2^666240253364 is an apocalyptic number.

It is an amenable number.

666240253364 is an abundant number, since it is smaller than the sum of its proper divisors (668607035404).

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

666240253364 is a wasteful number, since it uses less digits than its factorization.

666240253364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42263975 (or 42263973 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 47.

The spelling of 666240253364 in words is "six hundred sixty-six billion, two hundred forty million, two hundred fifty-three thousand, three hundred sixty-four".