1597582661 has 6 divisors (see below), whose sum is σ = 1604179890. Its totient is φ = 1590990576.

The previous prime is 1597582627. The next prime is 1597582673. The reversal of 1597582661 is 1662857951.

It can be written as a sum of positive squares in 3 ways, for example, as 618268225 + 979314436 = 24865^2 + 31294^2 .

It is not a de Polignac number, because 1597582661 - 2¹⁴ = 1597566277 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 (1597582601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 654335 + ... + 656771.

It is an arithmetic number, because the mean of its divisors is an integer number (267363315).

Almost surely, 2^1597582661 is an apocalyptic number.

It is an amenable number.

1597582661 is a deficient number, since it is larger than the sum of its proper divisors (6597229).

1597582661 is an frugal number, since it uses more digits than its factorization.

1597582661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143 (or 2706 counting only the distinct ones).

The product of its digits is 907200, while the sum is 50.

The square root of 1597582661 is about 39969.7718407298. The cubic root of 1597582661 is about 1169.0177698843.

The spelling of 1597582661 in words is "one billion, five hundred ninety-seven million, five hundred eighty-two thousand, six hundred sixty-one".