2640251405 has 16 divisors (see below), whose sum is σ = 3473712000. Its totient is φ = 1910525760.

The previous prime is 2640251377. The next prime is 2640251417. The reversal of 2640251405 is 5041520462.

2640251405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2640251405 - 2²² = 2636057101 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109670 + ... + 131559.

It is an arithmetic number, because the mean of its divisors is an integer number (217107000).

Almost surely, 2^2640251405 is an apocalyptic number.

It is an amenable number.

2640251405 is a deficient number, since it is larger than the sum of its proper divisors (833460595).

2640251405 is a wasteful number, since it uses less digits than its factorization.

2640251405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241444.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 2640251405 is about 51383.3767380074. The cubic root of 2640251405 is about 1382.1285161994.

Adding to 2640251405 its reverse (5041520462), we get a palindrome (7681771867).

The spelling of 2640251405 in words is "two billion, six hundred forty million, two hundred fifty-one thousand, four hundred five".