18972803450 has 24 divisors (see below), whose sum is σ = 35295462300. Its totient is φ = 7587820800.

The previous prime is 18972803407. The next prime is 18972803483. The reversal of 18972803450 is 5430827981.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 11046640609 + 7926162841 = 105103^2 + 89029^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18972803395 and 18972803404.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 294776 + ... + 353324.

Almost surely, 2^18972803450 is an apocalyptic number.

18972803450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18972803450 is a deficient number, since it is larger than the sum of its proper divisors (16322658850).

18972803450 is a wasteful number, since it uses less digits than its factorization.

18972803450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65042 (or 65037 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 18972803450 in words is "eighteen billion, nine hundred seventy-two million, eight hundred three thousand, four hundred fifty".