2596387591561 has 3 divisors (see below), whose sum is σ = 2596389202893. Its totient is φ = 2596385980230.

The previous prime is 2596387591559. The next prime is 2596387591639. The reversal of 2596387591561 is 1651957836952.

The square root of 2596387591561 is 1611331.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2596387591561 - 2¹ = 2596387591559 is a prime.

It is a super-2 number, since 2×2596387591561² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2596387591541) 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 2 ways as a sum of consecutive naturals, for example, 805666 + ... + 2416996.

It is an arithmetic number, because the mean of its divisors is an integer number (865463067631).

Almost surely, 2^{2596387591561} is an apocalyptic number.

2596387591561 is the 1611331-st square number.

2596387591561 is the 805666-th centered octagonal number.

It is an amenable number.

2596387591561 is a deficient number, since it is larger than the sum of its proper divisors (1611332).

2596387591561 is an frugal number, since it uses more digits than its factorization.

2596387591561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3222662 (or 1611331 counting only the distinct ones).

The product of its digits is 122472000, while the sum is 67.

The spelling of 2596387591561 in words is "two trillion, five hundred ninety-six billion, three hundred eighty-seven million, five hundred ninety-one thousand, five hundred sixty-one".