1664901799 has 6 divisors (see below), whose sum is σ = 1830016160. Its totient is φ = 1513546980.

The previous prime is 1664901781. The next prime is 1664901811. The reversal of 1664901799 is 9971094661.

It is not a de Polignac number, because 1664901799 - 2⁷ = 1664901671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664901709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6879639 + ... + 6879880.

Almost surely, 2^1664901799 is an apocalyptic number.

1664901799 is a deficient number, since it is larger than the sum of its proper divisors (165114361).

1664901799 is a wasteful number, since it uses less digits than its factorization.

1664901799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13759541 (or 13759530 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 1664901799 is about 40803.2081949447. The cubic root of 1664901799 is about 1185.2124572924.

The spelling of 1664901799 in words is "one billion, six hundred sixty-four million, nine hundred one thousand, seven hundred ninety-nine".