2665401405 has 64 divisors (see below), whose sum is σ = 4462214400. Its totient is φ = 1357701120.

The previous prime is 2665401341. The next prime is 2665401407. The reversal of 2665401405 is 5041045662.

It is not a de Polignac number, because 2665401405 - 2⁶ = 2665401341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665401407) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5236291 + ... + 5236799.

It is an arithmetic number, because the mean of its divisors is an integer number (69722100).

Almost surely, 2^2665401405 is an apocalyptic number.

It is an amenable number.

2665401405 is a deficient number, since it is larger than the sum of its proper divisors (1796812995).

2665401405 is a wasteful number, since it uses less digits than its factorization.

2665401405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 2665401405 is about 51627.5256525044. The cubic root of 2665401405 is about 1386.5031931444.

The spelling of 2665401405 in words is "two billion, six hundred sixty-five million, four hundred one thousand, four hundred five".