18983603961 has 57 divisors (see below), whose sum is σ = 33124451781. Its totient is φ = 10847773692.

The previous prime is 18983603959. The next prime is 18983603993. The reversal of 18983603961 is 16930638981.

The square root of 18983603961 is 137781.

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

It is not a de Polignac number, because 18983603961 - 2¹ = 18983603959 is a prime.

It is a nialpdrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 18983603898 and 18983603907.

It is not an unprimeable number, because it can be changed into a prime (18983603161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 56 ways as a sum of consecutive naturals, for example, 2711943420 + ... + 2711943426.

It is an arithmetic number, because the mean of its divisors is an integer number (581130733).

Almost surely, 2^18983603961 is an apocalyptic number.

18983603961 is the 137781-st square number.

18983603961 is the 68891-st centered octagonal number.

It is an amenable number.

18983603961 is a deficient number, since it is larger than the sum of its proper divisors (14140847820).

18983603961 is an frugal number, since it uses more digits than its factorization.

18983603961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 18983603961 in words is "eighteen billion, nine hundred eighty-three million, six hundred three thousand, nine hundred sixty-one".