636145851856 has 20 divisors (see below), whose sum is σ = 1297402724800. Its totient is φ = 301332245472.

The previous prime is 636145851851. The next prime is 636145851871. The reversal of 636145851856 is 658158541636.

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 636145851856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636145851851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1046292216 + ... + 1046292823.

It is an arithmetic number, because the mean of its divisors is an integer number (64870136240).

Almost surely, 2^636145851856 is an apocalyptic number.

It is an amenable number.

636145851856 is an abundant number, since it is smaller than the sum of its proper divisors (661256872944).

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

636145851856 is a wasteful number, since it uses less digits than its factorization.

636145851856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092585066 (or 2092585060 counting only the distinct ones).

The product of its digits is 20736000, while the sum is 58.

The spelling of 636145851856 in words is "six hundred thirty-six billion, one hundred forty-five million, eight hundred fifty-one thousand, eight hundred fifty-six".