2561797969 has 8 divisors (see below), whose sum is σ = 2651967360. Its totient is φ = 2471750736.

The previous prime is 2561797963. The next prime is 2561797991. The reversal of 2561797969 is 9697971652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2561797969 - 2¹⁵ = 2561765201 is a prime.

It is a super-2 number, since 2×2561797969² = 13125617667945049922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561797963) 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 7 ways as a sum of consecutive naturals, for example, 13224 + ... + 72790.

It is an arithmetic number, because the mean of its divisors is an integer number (331495920).

Almost surely, 2^2561797969 is an apocalyptic number.

2561797969 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2561797969 is a deficient number, since it is larger than the sum of its proper divisors (90169391).

2561797969 is a wasteful number, since it uses less digits than its factorization.

2561797969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61079.

The product of its digits is 12859560, while the sum is 61.

The square root of 2561797969 is about 50614.2071853348. The cubic root of 2561797969 is about 1368.3009411179.

The spelling of 2561797969 in words is "two billion, five hundred sixty-one million, seven hundred ninety-seven thousand, nine hundred sixty-nine".