18989203445 has 4 divisors (see below), whose sum is σ = 22787044140. Its totient is φ = 15191362752.

The previous prime is 18989203427. The next prime is 18989203463. The reversal of 18989203445 is 54430298981.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18989203427) and next prime (18989203463).

It can be written as a sum of positive squares in 2 ways, for example, as 2258815729 + 16730387716 = 47527^2 + 129346^2 .

It is a cyclic number.

It is not a de Polignac number, because 18989203445 - 2³⁰ = 17915461621 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1898920340 + ... + 1898920349.

It is an arithmetic number, because the mean of its divisors is an integer number (5696761035).

Almost surely, 2^18989203445 is an apocalyptic number.

It is an amenable number.

18989203445 is a deficient number, since it is larger than the sum of its proper divisors (3797840695).

18989203445 is an equidigital number, since it uses as much as digits as its factorization.

18989203445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797840694.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The spelling of 18989203445 in words is "eighteen billion, nine hundred eighty-nine million, two hundred three thousand, four hundred forty-five".