388574974666 has 4 divisors (see below), whose sum is σ = 582862462002. Its totient is φ = 194287487332.

The previous prime is 388574974651. The next prime is 388574974679. The reversal of 388574974666 is 666479475883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666479475883 = 13 ⋅51267651991.

It can be written as a sum of positive squares in only one way, i.e., 284333166441 + 104241808225 = 533229^2 + 322865^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97143743665 + ... + 97143743668.

Almost surely, 2^388574974666 is an apocalyptic number.

388574974666 is a deficient number, since it is larger than the sum of its proper divisors (194287487336).

388574974666 is a wasteful number, since it uses less digits than its factorization.

388574974666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194287487335.

The product of its digits is 1463132160, while the sum is 73.

The spelling of 388574974666 in words is "three hundred eighty-eight billion, five hundred seventy-four million, nine hundred seventy-four thousand, six hundred sixty-six".