2566561782 has 32 divisors (see below), whose sum is σ = 5249035872. Its totient is φ = 836319744.

The previous prime is 2566561687. The next prime is 2566561783. The reversal of 2566561782 is 2871656652.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566561783) 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, 73518 + ... + 102654.

It is an arithmetic number, because the mean of its divisors is an integer number (164032371).

Almost surely, 2^2566561782 is an apocalyptic number.

2566561782 is an abundant number, since it is smaller than the sum of its proper divisors (2682474090).

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

2566561782 is a wasteful number, since it uses less digits than its factorization.

2566561782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29472.

The product of its digits is 1209600, while the sum is 48.

The square root of 2566561782 is about 50661.2453656639. The cubic root of 2566561782 is about 1369.1485611168.

The spelling of 2566561782 in words is "two billion, five hundred sixty-six million, five hundred sixty-one thousand, seven hundred eighty-two".