2661565364 has 12 divisors (see below), whose sum is σ = 4818351300. Its totient is φ = 1284893568.

The previous prime is 2661565351. The next prime is 2661565369. The reversal of 2661565364 is 4635651662.

It can be written as a sum of positive squares in 2 ways, for example, as 889828900 + 1771736464 = 29830^2 + 42092^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661565369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11472149 + ... + 11472380.

It is an arithmetic number, because the mean of its divisors is an integer number (401529275).

Almost surely, 2^2661565364 is an apocalyptic number.

It is an amenable number.

2661565364 is a deficient number, since it is larger than the sum of its proper divisors (2156785936).

2661565364 is a wasteful number, since it uses less digits than its factorization.

2661565364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22944562 (or 22944560 counting only the distinct ones).

The product of its digits is 777600, while the sum is 44.

The square root of 2661565364 is about 51590.3611539985. The cubic root of 2661565364 is about 1385.8377228111.

The spelling of 2661565364 in words is "two billion, six hundred sixty-one million, five hundred sixty-five thousand, three hundred sixty-four".