1387625666 has 16 divisors (see below), whose sum is σ = 2379842304. Its totient is φ = 594432864.

The previous prime is 1387625647. The next prime is 1387625711. The reversal of 1387625666 is 6665267831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12566 + ... + 54158.

It is an arithmetic number, because the mean of its divisors is an integer number (148740144).

Almost surely, 2^1387625666 is an apocalyptic number.

1387625666 is a deficient number, since it is larger than the sum of its proper divisors (992216638).

1387625666 is a wasteful number, since it uses less digits than its factorization.

1387625666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43985.

The product of its digits is 2177280, while the sum is 50.

The square root of 1387625666 is about 37250.8478561227. The cubic root of 1387625666 is about 1115.3832236578.

The spelling of 1387625666 in words is "one billion, three hundred eighty-seven million, six hundred twenty-five thousand, six hundred sixty-six".