108661870321 has 3 divisors (see below), whose sum is σ = 108662199961. Its totient is φ = 108661540682.

The previous prime is 108661870319. The next prime is 108661870349. The reversal of 108661870321 is 123078166801.

The square root of 108661870321 is 329639.

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.

It is not a de Polignac number, because 108661870321 - 2¹ = 108661870319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108661870391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 164820 + ... + 494458.

Almost surely, 2^108661870321 is an apocalyptic number.

108661870321 is the 329639-th square number.

108661870321 is the 164820-th centered octagonal number.

It is an amenable number.

108661870321 is a deficient number, since it is larger than the sum of its proper divisors (329640).

108661870321 is an frugal number, since it uses more digits than its factorization.

108661870321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659278 (or 329639 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 108661870321 in words is "one hundred eight billion, six hundred sixty-one million, eight hundred seventy thousand, three hundred twenty-one".