1597638165 has 32 divisors (see below), whose sum is σ = 2645271552. Its totient is φ = 822528000.

The previous prime is 1597638149. The next prime is 1597638169. The reversal of 1597638165 is 5618367951.

It is not a de Polignac number, because 1597638165 - 2⁴ = 1597638149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1597638169) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 191685 + ... + 199845.

It is an arithmetic number, because the mean of its divisors is an integer number (82664736).

Almost surely, 2^1597638165 is an apocalyptic number.

1597638165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1597638165 is a deficient number, since it is larger than the sum of its proper divisors (1047633387).

1597638165 is a wasteful number, since it uses less digits than its factorization.

1597638165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8621.

The product of its digits is 1360800, while the sum is 51.

The square root of 1597638165 is about 39970.4661594032. The cubic root of 1597638165 is about 1169.0313079237.

The spelling of 1597638165 in words is "one billion, five hundred ninety-seven million, six hundred thirty-eight thousand, one hundred sixty-five".