1664412917 has 16 divisors (see below), whose sum is σ = 1783555200. Its totient is φ = 1549363200.

The previous prime is 1664412859. The next prime is 1664412923. The reversal of 1664412917 is 7192144661.

It is a cyclic number.

It is not a de Polignac number, because 1664412917 - 2⁶ = 1664412853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664412017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421442 + ... + 425372.

It is an arithmetic number, because the mean of its divisors is an integer number (111472200).

Almost surely, 2^1664412917 is an apocalyptic number.

It is an amenable number.

1664412917 is a deficient number, since it is larger than the sum of its proper divisors (119142283).

1664412917 is a wasteful number, since it uses less digits than its factorization.

1664412917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444.

The product of its digits is 72576, while the sum is 41.

The square root of 1664412917 is about 40797.2170251845. The cubic root of 1664412917 is about 1185.0964372844.

The spelling of 1664412917 in words is "one billion, six hundred sixty-four million, four hundred twelve thousand, nine hundred seventeen".