2638521618 has 16 divisors (see below), whose sum is σ = 5587457760. Its totient is φ = 827771456.

The previous prime is 2638521551. The next prime is 2638521623. The reversal of 2638521618 is 8161258362.

It is a self number, because there is not a number n which added to its sum of digits gives 2638521618.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12933828 + ... + 12934031.

It is an arithmetic number, because the mean of its divisors is an integer number (349216110).

Almost surely, 2^2638521618 is an apocalyptic number.

2638521618 is an abundant number, since it is smaller than the sum of its proper divisors (2948936142).

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

2638521618 is a wasteful number, since it uses less digits than its factorization.

2638521618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25867881.

The product of its digits is 138240, while the sum is 42.

The square root of 2638521618 is about 51366.5418146871. The cubic root of 2638521618 is about 1381.8266118376.

The spelling of 2638521618 in words is "two billion, six hundred thirty-eight million, five hundred twenty-one thousand, six hundred eighteen".