1664125375 has 32 divisors (see below), whose sum is σ = 2282192640. Its totient is φ = 1201428000.

The previous prime is 1664125369. The next prime is 1664125409. The reversal of 1664125375 is 5735214661.

It is not a de Polignac number, because 1664125375 - 2¹⁹ = 1663601087 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186772 + ... + 195478.

It is an arithmetic number, because the mean of its divisors is an integer number (71318520).

Almost surely, 2^1664125375 is an apocalyptic number.

1664125375 is a deficient number, since it is larger than the sum of its proper divisors (618067265).

1664125375 is a wasteful number, since it uses less digits than its factorization.

1664125375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8872 (or 8862 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 1664125375 is about 40793.6928335742. The cubic root of 1664125375 is about 1185.0281880694.

The spelling of 1664125375 in words is "one billion, six hundred sixty-four million, one hundred twenty-five thousand, three hundred seventy-five".