666394221374 has 32 divisors (see below), whose sum is σ = 1146263892480. Its totient is φ = 284629913568.

The previous prime is 666394221329. The next prime is 666394221433. The reversal of 666394221374 is 473122493666.

666394221374 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9823079 + ... + 9890685.

It is an arithmetic number, because the mean of its divisors is an integer number (35820746640).

Almost surely, 2^666394221374 is an apocalyptic number.

666394221374 is a deficient number, since it is larger than the sum of its proper divisors (479869671106).

666394221374 is a wasteful number, since it uses less digits than its factorization.

666394221374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69992.

The product of its digits is 7838208, while the sum is 53.

The spelling of 666394221374 in words is "six hundred sixty-six billion, three hundred ninety-four million, two hundred twenty-one thousand, three hundred seventy-four".