2500756566 has 64 divisors (see below), whose sum is σ = 6297509376. Its totient is φ = 643104000.

The previous prime is 2500756537. The next prime is 2500756571. The reversal of 2500756566 is 6656570052.

It is a happy number.

It is a super-2 number, since 2×2500756566² = 12507566804784224712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19866 + ... + 73458.

It is an arithmetic number, because the mean of its divisors is an integer number (98398584).

Almost surely, 2^2500756566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2500756566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3148754688).

2500756566 is an abundant number, since it is smaller than the sum of its proper divisors (3796752810).

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

2500756566 is a wasteful number, since it uses less digits than its factorization.

2500756566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53717.

The product of its (nonzero) digits is 378000, while the sum is 42.

The square root of 2500756566 is about 50007.5650876945. The cubic root of 2500756566 is about 1357.3457035609.

The spelling of 2500756566 in words is "two billion, five hundred million, seven hundred fifty-six thousand, five hundred sixty-six".