2566420815 has 48 divisors (see below), whose sum is σ = 4887831168. Its totient is φ = 1145922624.

The previous prime is 2566420811. The next prime is 2566420841. The reversal of 2566420815 is 5180246652.

It is not a de Polignac number, because 2566420815 - 2² = 2566420811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566420811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8997 + ... + 72206.

It is an arithmetic number, because the mean of its divisors is an integer number (101829816).

Almost surely, 2^2566420815 is an apocalyptic number.

2566420815 is a deficient number, since it is larger than the sum of its proper divisors (2321410353).

2566420815 is a wasteful number, since it uses less digits than its factorization.

2566420815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81268 (or 81261 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 2566420815 is about 50659.8540759841. The cubic root of 2566420815 is about 1369.1234940796.

The spelling of 2566420815 in words is "two billion, five hundred sixty-six million, four hundred twenty thousand, eight hundred fifteen".