108645412202721 has 9 divisors (see below), whose sum is σ = 156932307238291. Its totient is φ = 72430253955192.

The previous prime is 108645412202689. The next prime is 108645412202749. The reversal of 108645412202721 is 127202214546801.

The square root of 108645412202721 is 10423311.

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

108645412202721 is a `hidden beast` number, since 1 + 0 + 8 + 6 + 4 + 5 + 412 + 202 + 7 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 49551814883025 + 59093597319696 = 7039305^2 + 7687236^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 108645412202721 - 2⁵ = 108645412202689 is a prime.

It is a super-3 number, since 3×108645412202721³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108645412202021) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 29532715 + ... + 33007151.

Almost surely, 2^{108645412202721} is an apocalyptic number.

108645412202721 is the 10423311-st square number.

108645412202721 is the 5211656-th centered octagonal number.

It is an amenable number.

108645412202721 is a deficient number, since it is larger than the sum of its proper divisors (48286895035570).

108645412202721 is an frugal number, since it uses more digits than its factorization.

108645412202721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6948880 (or 3474440 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 108645412202721 in words is "one hundred eight trillion, six hundred forty-five billion, four hundred twelve million, two hundred two thousand, seven hundred twenty-one".