2641665138 has 32 divisors (see below), whose sum is σ = 6300619776. Its totient is φ = 721945488.

The previous prime is 2641665107. The next prime is 2641665149. The reversal of 2641665138 is 8315661462.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 2641665138.

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 15 ways as a sum of consecutive naturals, for example, 1366356 + ... + 1368287.

It is an arithmetic number, because the mean of its divisors is an integer number (196894368).

Almost surely, 2^2641665138 is an apocalyptic number.

2641665138 is an abundant number, since it is smaller than the sum of its proper divisors (3658954638).

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

2641665138 is a wasteful number, since it uses less digits than its factorization.

2641665138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2734678.

The product of its digits is 207360, while the sum is 42.

The square root of 2641665138 is about 51397.1316125715. The cubic root of 2641665138 is about 1382.3751608992.

The spelling of 2641665138 in words is "two billion, six hundred forty-one million, six hundred sixty-five thousand, one hundred thirty-eight".