1636375668 has 24 divisors (see below), whose sum is σ = 3820746720. Its totient is φ = 545096160.

The previous prime is 1636375661. The next prime is 1636375669. The reversal of 1636375668 is 8665736361.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1636375668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1636375661) by changing a digit.

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, 26163 + ... + 62906.

It is an arithmetic number, because the mean of its divisors is an integer number (159197780).

Almost surely, 2^1636375668 is an apocalyptic number.

It is an amenable number.

1636375668 is an abundant number, since it is smaller than the sum of its proper divisors (2184371052).

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

1636375668 is a wasteful number, since it uses less digits than its factorization.

1636375668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90607 (or 90605 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 51.

The square root of 1636375668 is about 40452.1404625268. The cubic root of 1636375668 is about 1178.4043519330.

The spelling of 1636375668 in words is "one billion, six hundred thirty-six million, three hundred seventy-five thousand, six hundred sixty-eight".