2599272661 has 4 divisors (see below), whose sum is σ = 2599686892. Its totient is φ = 2598858432.

The previous prime is 2599272659. The next prime is 2599272677. The reversal of 2599272661 is 1662729952.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1866758436 + 732514225 = 43206^2 + 27065^2 .

It is a cyclic number.

It is not a de Polignac number, because 2599272661 - 2¹ = 2599272659 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 (2599272601) 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 3 ways as a sum of consecutive naturals, for example, 197556 + ... + 210301.

It is an arithmetic number, because the mean of its divisors is an integer number (649921723).

Almost surely, 2^2599272661 is an apocalyptic number.

It is an amenable number.

2599272661 is a deficient number, since it is larger than the sum of its proper divisors (414231).

2599272661 is an equidigital number, since it uses as much as digits as its factorization.

2599272661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414230.

The product of its digits is 816480, while the sum is 49.

The square root of 2599272661 is about 50983.0624913804. The cubic root of 2599272661 is about 1374.9406318830.

The spelling of 2599272661 in words is "two billion, five hundred ninety-nine million, two hundred seventy-two thousand, six hundred sixty-one".