108918787653 has 48 divisors (see below), whose sum is σ = 179460655920. Its totient is φ = 63061327872.

The previous prime is 108918787631. The next prime is 108918787661. The reversal of 108918787653 is 356787819801.

It can be written as a sum of positive squares in 8 ways, for example, as 19943653284 + 88975134369 = 141222^2 + 298287^2 .

It is not a de Polignac number, because 108918787653 - 2⁶ = 108918787589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108918787693) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6581293 + ... + 6597821.

It is an arithmetic number, because the mean of its divisors is an integer number (3738763665).

Almost surely, 2^108918787653 is an apocalyptic number.

108918787653 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

108918787653 is a deficient number, since it is larger than the sum of its proper divisors (70541868267).

108918787653 is a wasteful number, since it uses less digits than its factorization.

108918787653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19878 (or 19875 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 63.

The spelling of 108918787653 in words is "one hundred eight billion, nine hundred eighteen million, seven hundred eighty-seven thousand, six hundred fifty-three".