2564863381 has 8 divisors (see below), whose sum is σ = 2603986560. Its totient is φ = 2525765088.

The previous prime is 2564863373. The next prime is 2564863391. The reversal of 2564863381 is 1833684652.

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

It is a cyclic number.

It is not a de Polignac number, because 2564863381 - 2³ = 2564863373 is a prime.

It is a super-2 number, since 2×2564863381² = 13157048326389502322, 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 (2564863391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404820 + ... + 411106.

It is an arithmetic number, because the mean of its divisors is an integer number (325498320).

Almost surely, 2^2564863381 is an apocalyptic number.

It is an amenable number.

2564863381 is a deficient number, since it is larger than the sum of its proper divisors (39123179).

2564863381 is an equidigital number, since it uses as much as digits as its factorization.

2564863381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12443.

The product of its digits is 829440, while the sum is 46.

The square root of 2564863381 is about 50644.4802619200. The cubic root of 2564863381 is about 1368.8464869021.

The spelling of 2564863381 in words is "two billion, five hundred sixty-four million, eight hundred sixty-three thousand, three hundred eighty-one".