1665221252 has 12 divisors (see below), whose sum is σ = 3040838976. Its totient is φ = 796410120.

The previous prime is 1665221227. The next prime is 1665221293. The reversal of 1665221252 is 2521225661.

It is a super-2 number, since 2×1665221252² = 5545923636224895008, 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, 9050024 + ... + 9050207.

It is an arithmetic number, because the mean of its divisors is an integer number (253403248).

Almost surely, 2^1665221252 is an apocalyptic number.

It is an amenable number.

1665221252 is a deficient number, since it is larger than the sum of its proper divisors (1375617724).

1665221252 is a wasteful number, since it uses less digits than its factorization.

1665221252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18100258 (or 18100256 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 1665221252 is about 40807.1225645720. The cubic root of 1665221252 is about 1185.2882566503.

The spelling of 1665221252 in words is "one billion, six hundred sixty-five million, two hundred twenty-one thousand, two hundred fifty-two".