2665121601 has 16 divisors (see below), whose sum is σ = 3590737280. Its totient is φ = 1758153600.

The previous prime is 2665121593. The next prime is 2665121609. The reversal of 2665121601 is 1061215662.

2665121601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2665121593) and next prime (2665121609).

It is not a de Polignac number, because 2665121601 - 2³ = 2665121593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2665121609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 554115 + ... + 558903.

It is an arithmetic number, because the mean of its divisors is an integer number (224421080).

Almost surely, 2^2665121601 is an apocalyptic number.

It is an amenable number.

2665121601 is a deficient number, since it is larger than the sum of its proper divisors (925615679).

2665121601 is a wasteful number, since it uses less digits than its factorization.

2665121601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6696.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 2665121601 is about 51624.8157478552. The cubic root of 2665121601 is about 1386.4546747844.

The spelling of 2665121601 in words is "two billion, six hundred sixty-five million, one hundred twenty-one thousand, six hundred one".