1664772912 has 200 divisors, whose sum is σ = 5427366912. Its totient is φ = 488073600.

The previous prime is 1664772887. The next prime is 1664772917. The reversal of 1664772912 is 2192774661.

1664772912 is a `hidden beast` number, since 166 + 477 + 2 + 9 + 12 = 666.

It is not an unprimeable number, because it can be changed into a prime (1664772917) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 440053 + ... + 443819.

Almost surely, 2^1664772912 is an apocalyptic number.

1664772912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1664772912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2713683456).

1664772912 is an abundant number, since it is smaller than the sum of its proper divisors (3762594000).

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

1664772912 is a wasteful number, since it uses less digits than its factorization.

1664772912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3829 (or 3814 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 1664772912 is about 40801.6287910176. The cubic root of 1664772912 is about 1185.1818724215.

The spelling of 1664772912 in words is "one billion, six hundred sixty-four million, seven hundred seventy-two thousand, nine hundred twelve".