2561217762 has 32 divisors (see below), whose sum is σ = 5412833280. Its totient is φ = 806279760.

The previous prime is 2561217733. The next prime is 2561217781. The reversal of 2561217762 is 2677121652.

It is a self number, because there is not a number n which added to its sum of digits gives 2561217762.

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 15 ways as a sum of consecutive naturals, for example, 106564 + ... + 128367.

It is an arithmetic number, because the mean of its divisors is an integer number (169151040).

Almost surely, 2^2561217762 is an apocalyptic number.

2561217762 is an abundant number, since it is smaller than the sum of its proper divisors (2851615518).

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

2561217762 is a wasteful number, since it uses less digits than its factorization.

2561217762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235038.

The product of its digits is 70560, while the sum is 39.

The square root of 2561217762 is about 50608.4751993181. The cubic root of 2561217762 is about 1368.1976337615.

The spelling of 2561217762 in words is "two billion, five hundred sixty-one million, two hundred seventeen thousand, seven hundred sixty-two".