2665271640 has 32 divisors (see below), whose sum is σ = 7995815280. Its totient is φ = 710739072.

The previous prime is 2665271639. The next prime is 2665271659. The reversal of 2665271640 is 461725662.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11105179 + ... + 11105418.

Almost surely, 2^2665271640 is an apocalyptic number.

2665271640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2665271640 is an abundant number, since it is smaller than the sum of its proper divisors (5330543640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2665271640 is a wasteful number, since it uses less digits than its factorization.

2665271640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22210611 (or 22210607 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 2665271640 is about 51626.2688948175. The cubic root of 2665271640 is about 1386.4806921550.

The spelling of 2665271640 in words is "two billion, six hundred sixty-five million, two hundred seventy-one thousand, six hundred forty".