1664165356 has 12 divisors (see below), whose sum is σ = 3328330768. Its totient is φ = 713213712.

The previous prime is 1664165341. The next prime is 1664165389. The reversal of 1664165356 is 6535614661.

1664165356 is an admirable number.

It is a super-2 number, since 2×1664165356² = 5538892664221213472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29717211 + ... + 29717266.

Almost surely, 2^1664165356 is an apocalyptic number.

It is an amenable number.

1664165356 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1664165356 is a wasteful number, since it uses less digits than its factorization.

1664165356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59434488 (or 59434486 counting only the distinct ones).

The product of its digits is 388800, while the sum is 43.

The square root of 1664165356 is about 40794.1828696200. The cubic root of 1664165356 is about 1185.0376781862.

The spelling of 1664165356 in words is "one billion, six hundred sixty-four million, one hundred sixty-five thousand, three hundred fifty-six".