2564442665 has 8 divisors (see below), whose sum is σ = 3082960320. Its totient is φ = 2047801392.

The previous prime is 2564442659. The next prime is 2564442677. The reversal of 2564442665 is 5662444652.

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 2564442665 - 2⁸ = 2564442409 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466085 + ... + 471554.

It is an arithmetic number, because the mean of its divisors is an integer number (385370040).

Almost surely, 2^2564442665 is an apocalyptic number.

It is an amenable number.

2564442665 is a deficient number, since it is larger than the sum of its proper divisors (518517655).

2564442665 is an equidigital number, since it uses as much as digits as its factorization.

2564442665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938191.

The product of its digits is 1382400, while the sum is 44.

The square root of 2564442665 is about 50640.3264701167. The cubic root of 2564442665 is about 1368.7716385868.

The spelling of 2564442665 in words is "two billion, five hundred sixty-four million, four hundred forty-two thousand, six hundred sixty-five".