636989797143 has 32 divisors (see below), whose sum is σ = 1135264473600. Its totient is φ = 344836579968.

The previous prime is 636989797123. The next prime is 636989797183. The reversal of 636989797143 is 341797989636.

It is not a de Polignac number, because 636989797143 - 2¹² = 636989793047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636989797123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88688946 + ... + 88696127.

It is an arithmetic number, because the mean of its divisors is an integer number (35477014800).

Almost surely, 2^636989797143 is an apocalyptic number.

636989797143 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

636989797143 is a deficient number, since it is larger than the sum of its proper divisors (498274676457).

636989797143 is a wasteful number, since it uses less digits than its factorization.

636989797143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177385108 (or 177385102 counting only the distinct ones).

The product of its digits is 370355328, while the sum is 72.

The spelling of 636989797143 in words is "six hundred thirty-six billion, nine hundred eighty-nine million, seven hundred ninety-seven thousand, one hundred forty-three".