2561859723 has 4 divisors (see below), whose sum is σ = 3415812968. Its totient is φ = 1707906480.

The previous prime is 2561859689. The next prime is 2561859791. The reversal of 2561859723 is 3279581652.

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

It is not a de Polignac number, because 2561859723 - 2⁸ = 2561859467 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (2561854723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426976618 + ... + 426976623.

It is an arithmetic number, because the mean of its divisors is an integer number (853953242).

Almost surely, 2^2561859723 is an apocalyptic number.

2561859723 is a deficient number, since it is larger than the sum of its proper divisors (853953245).

2561859723 is an equidigital number, since it uses as much as digits as its factorization.

2561859723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853953244.

The product of its digits is 907200, while the sum is 48.

The square root of 2561859723 is about 50614.8172277644. The cubic root of 2561859723 is about 1368.3119356587.

The spelling of 2561859723 in words is "two billion, five hundred sixty-one million, eight hundred fifty-nine thousand, seven hundred twenty-three".