2564243655 has 16 divisors (see below), whose sum is σ = 4244266080. Its totient is φ = 1320437888.

The previous prime is 2564243653. The next prime is 2564243657. The reversal of 2564243655 is 5563424652.

It is an interprime number because it is at equal distance from previous prime (2564243653) and next prime (2564243657).

It is a cyclic number.

It is not a de Polignac number, because 2564243655 - 2¹ = 2564243653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564243653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2946972 + ... + 2947841.

It is an arithmetic number, because the mean of its divisors is an integer number (265266630).

Almost surely, 2^2564243655 is an apocalyptic number.

2564243655 is a deficient number, since it is larger than the sum of its proper divisors (1680022425).

2564243655 is a wasteful number, since it uses less digits than its factorization.

2564243655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5894850.

The product of its digits is 864000, while the sum is 42.

The square root of 2564243655 is about 50638.3614960042. The cubic root of 2564243655 is about 1368.7362304655.

The spelling of 2564243655 in words is "two billion, five hundred sixty-four million, two hundred forty-three thousand, six hundred fifty-five".