18897506903 has 6 divisors (see below), whose sum is σ = 20771639952. Its totient is φ = 17179551620.

The previous prime is 18897506897. The next prime is 18897506917. The reversal of 18897506903 is 30960579881.

It is not a de Polignac number, because 18897506903 - 2¹² = 18897502807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18897506983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78088751 + ... + 78088992.

It is an arithmetic number, because the mean of its divisors is an integer number (3461939992).

Almost surely, 2^18897506903 is an apocalyptic number.

18897506903 is a deficient number, since it is larger than the sum of its proper divisors (1874133049).

18897506903 is a wasteful number, since it uses less digits than its factorization.

18897506903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156177765 (or 156177754 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 18897506903 in words is "eighteen billion, eight hundred ninety-seven million, five hundred six thousand, nine hundred three".