2568492781 has 4 divisors (see below), whose sum is σ = 2568931200. Its totient is φ = 2568054364.

The previous prime is 2568492761. The next prime is 2568492803. The reversal of 2568492781 is 1872948652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2568492781 - 2¹⁷ = 2568361709 is a prime.

It is a super-2 number, since 2×2568492781² = 13194310332098227922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2568492761) 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, 210301 + ... + 222178.

It is an arithmetic number, because the mean of its divisors is an integer number (642232800).

Almost surely, 2^2568492781 is an apocalyptic number.

It is an amenable number.

2568492781 is a deficient number, since it is larger than the sum of its proper divisors (438419).

2568492781 is an equidigital number, since it uses as much as digits as its factorization.

2568492781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438418.

The product of its digits is 1935360, while the sum is 52.

The square root of 2568492781 is about 50680.2997327364. The cubic root of 2568492781 is about 1369.4918429027.

The spelling of 2568492781 in words is "two billion, five hundred sixty-eight million, four hundred ninety-two thousand, seven hundred eighty-one".