2566398810 has 64 divisors (see below), whose sum is σ = 6460549632. Its totient is φ = 651695616.

The previous prime is 2566398803. The next prime is 2566398833. The reversal of 2566398810 is 188936652.

It is a happy number.

It is a super-2 number, since 2×2566398810² = 13172805703938832200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2566398810.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27574 + ... + 76766.

It is an arithmetic number, because the mean of its divisors is an integer number (100946088).

Almost surely, 2^2566398810 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2566398810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3230274816).

2566398810 is an abundant number, since it is smaller than the sum of its proper divisors (3894150822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2566398810 is a wasteful number, since it uses less digits than its factorization.

2566398810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49287.

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 2566398810 is about 50659.6368917109. The cubic root of 2566398810 is about 1369.1195810231.

The spelling of 2566398810 in words is "two billion, five hundred sixty-six million, three hundred ninety-eight thousand, eight hundred ten".