636141838722 has 128 divisors (see below), whose sum is σ = 1455659251200. Its totient is φ = 183859974144.

The previous prime is 636141838693. The next prime is 636141838729. The reversal of 636141838722 is 227838141636.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (636141838729) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22082304 + ... + 22111092.

It is an arithmetic number, because the mean of its divisors is an integer number (11372337900).

Almost surely, 2^636141838722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636141838722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (727829625600).

636141838722 is an abundant number, since it is smaller than the sum of its proper divisors (819517412478).

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

636141838722 is a wasteful number, since it uses less digits than its factorization.

636141838722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29052.

The product of its digits is 2322432, while the sum is 51.

The spelling of 636141838722 in words is "six hundred thirty-six billion, one hundred forty-one million, eight hundred thirty-eight thousand, seven hundred twenty-two".