2168595261 has 20 divisors (see below), whose sum is σ = 3702294112. Its totient is φ = 1239196968.

The previous prime is 2168595217. The next prime is 2168595287. The reversal of 2168595261 is 1625958612.

It is not a de Polignac number, because 2168595261 - 2⁷ = 2168595133 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 (2168595461) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1911775 + ... + 1912908.

Almost surely, 2^2168595261 is an apocalyptic number.

2168595261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2168595261 is a deficient number, since it is larger than the sum of its proper divisors (1533698851).

2168595261 is an equidigital number, since it uses as much as digits as its factorization.

2168595261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3824702 (or 3824693 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 2168595261 is about 46568.1786309063. The cubic root of 2168595261 is about 1294.3731677141.

The spelling of 2168595261 in words is "two billion, one hundred sixty-eight million, five hundred ninety-five thousand, two hundred sixty-one".