2665761536656 has 45 divisors (see below), whose sum is σ = 5239594203753. Its totient is φ = 1313879219520.

The previous prime is 2665761536597. The next prime is 2665761536657. The reversal of 2665761536656 is 6566351675662.

The square root of 2665761536656 is 1632716.

It is a perfect power (a square), and thus also a powerful number.

2665761536656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 45248096656 + 2620513440000 = 212716^2 + 1618800^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2665761536657) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 463688470 + ... + 463694218.

Almost surely, 2^{2665761536656} is an apocalyptic number.

2665761536656 is the 1632716-th square number.

It is an amenable number.

2665761536656 is a deficient number, since it is larger than the sum of its proper divisors (2573832667097).

2665761536656 is an frugal number, since it uses more digits than its factorization.

2665761536656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11648 (or 5822 counting only the distinct ones).

The product of its digits is 244944000, while the sum is 64.

Multiplying 2665761536656 by its sum of digits (64), we get a square (170608738345984 = 13061728²).

The spelling of 2665761536656 in words is "two trillion, six hundred sixty-five billion, seven hundred sixty-one million, five hundred thirty-six thousand, six hundred fifty-six".