18980297361 has 27 divisors (see below), whose sum is σ = 28946852571. Its totient is φ = 11982596544.

The previous prime is 18980297269. The next prime is 18980297381. The reversal of 18980297361 is 16379208981.

The square root of 18980297361 is 137769.

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

18980297361 is a `hidden beast` number, since 189 + 80 + 29 + 7 + 361 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18481043025 + 499254336 = 135945^2 + 22344^2 .

It is not a de Polignac number, because 18980297361 - 2⁹ = 18980296849 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18980297298 and 18980297307.

It is not an unprimeable number, because it can be changed into a prime (18980297381) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7851625 + ... + 7854041.

Almost surely, 2^18980297361 is an apocalyptic number.

18980297361 is the 137769-th square number.

18980297361 is the 68885-th centered octagonal number.

It is an amenable number.

18980297361 is a deficient number, since it is larger than the sum of its proper divisors (9966555210).

18980297361 is an frugal number, since it uses more digits than its factorization.

18980297361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4878 (or 2439 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 18980297361 in words is "eighteen billion, nine hundred eighty million, two hundred ninety-seven thousand, three hundred sixty-one".