108187708561 has 3 divisors (see below), whose sum is σ = 108188037481. Its totient is φ = 108187379642.

The previous prime is 108187708549. The next prime is 108187708571. The reversal of 108187708561 is 165807781801.

The square root of 108187708561 is 328919.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 165807781801 = 863 ⋅192129527.

It is not a de Polignac number, because 108187708561 - 2⁵ = 108187708529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 108187708499 and 108187708508.

It is not an unprimeable number, because it can be changed into a prime (108187708571) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 164460 + ... + 493378.

Almost surely, 2^108187708561 is an apocalyptic number.

108187708561 is the 328919-th square number.

108187708561 is the 164460-th centered octagonal number.

It is an amenable number.

108187708561 is a deficient number, since it is larger than the sum of its proper divisors (328920).

108187708561 is an frugal number, since it uses more digits than its factorization.

108187708561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657838 (or 328919 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 52.

The spelling of 108187708561 in words is "one hundred eight billion, one hundred eighty-seven million, seven hundred eight thousand, five hundred sixty-one".