2561162766 has 16 divisors (see below), whose sum is σ = 5124186624. Its totient is φ = 853410744.

The previous prime is 2561162729. The next prime is 2561162777. The reversal of 2561162766 is 6672611652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59326 + ... + 92961.

It is an arithmetic number, because the mean of its divisors is an integer number (320261664).

Almost surely, 2^2561162766 is an apocalyptic number.

2561162766 is an abundant number, since it is smaller than the sum of its proper divisors (2563023858).

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

2561162766 is a wasteful number, since it uses less digits than its factorization.

2561162766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155095.

The product of its digits is 181440, while the sum is 42.

The square root of 2561162766 is about 50607.9318486737. The cubic root of 2561162766 is about 1368.1878407721.

The spelling of 2561162766 in words is "two billion, five hundred sixty-one million, one hundred sixty-two thousand, seven hundred sixty-six".