2665202661 has 12 divisors (see below), whose sum is σ = 4199713440. Its totient is φ = 1615274280.

The previous prime is 2665202627. The next prime is 2665202677. The reversal of 2665202661 is 1662025662.

It is not a de Polignac number, because 2665202661 - 2¹⁵ = 2665169893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665202261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13460521 + ... + 13460718.

It is an arithmetic number, because the mean of its divisors is an integer number (349976120).

Almost surely, 2^2665202661 is an apocalyptic number.

It is an amenable number.

2665202661 is a deficient number, since it is larger than the sum of its proper divisors (1534510779).

2665202661 is a wasteful number, since it uses less digits than its factorization.

2665202661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26921256 (or 26921253 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 2665202661 is about 51625.6008294335. The cubic root of 2665202661 is about 1386.4687310381.

The spelling of 2665202661 in words is "two billion, six hundred sixty-five million, two hundred two thousand, six hundred sixty-one".