2566660365 has 40 divisors (see below), whose sum is σ = 4698904320. Its totient is φ = 1339750368.

The previous prime is 2566660361. The next prime is 2566660381. The reversal of 2566660365 is 5630666652.

It is not a de Polignac number, because 2566660365 - 2² = 2566660361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a nialpdrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 2566660365.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566660361) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 48385 + ... + 86454.

It is an arithmetic number, because the mean of its divisors is an integer number (117472608).

Almost surely, 2^2566660365 is an apocalyptic number.

It is an amenable number.

2566660365 is a deficient number, since it is larger than the sum of its proper divisors (2132243955).

2566660365 is a wasteful number, since it uses less digits than its factorization.

2566660365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134903 (or 134894 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 45.

The square root of 2566660365 is about 50662.2183189801. The cubic root of 2566660365 is about 1369.1660907999.

The spelling of 2566660365 in words is "two billion, five hundred sixty-six million, six hundred sixty thousand, three hundred sixty-five".