1665589797 has 24 divisors (see below), whose sum is σ = 2496958464. Its totient is φ = 1109503008.

The previous prime is 1665589771. The next prime is 1665589853. The reversal of 1665589797 is 7979855661.

1665589797 is a `hidden beast` number, since 1 + 6 + 6 + 558 + 9 + 79 + 7 = 666.

It is not a de Polignac number, because 1665589797 - 2¹⁶ = 1665524261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665589727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 463068 + ... + 466650.

It is an arithmetic number, because the mean of its divisors is an integer number (104039936).

Almost surely, 2^1665589797 is an apocalyptic number.

It is an amenable number.

1665589797 is a deficient number, since it is larger than the sum of its proper divisors (831368667).

1665589797 is an equidigital number, since it uses as much as digits as its factorization.

1665589797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5511 (or 5499 counting only the distinct ones).

The product of its digits is 28576800, while the sum is 63.

The square root of 1665589797 is about 40811.6380092738. The cubic root of 1665589797 is about 1185.3756924465.

The spelling of 1665589797 in words is "one billion, six hundred sixty-five million, five hundred eighty-nine thousand, seven hundred ninety-seven".