18210739897 has 48 divisors (see below), whose sum is σ = 22246963200. Its totient is φ = 14848378272.

The previous prime is 18210739879. The next prime is 18210739903. The reversal of 18210739897 is 79893701281.

It is a de Polignac number, because none of the positive numbers 2^k-18210739897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18210739837) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30401604 + ... + 30402202.

It is an arithmetic number, because the mean of its divisors is an integer number (463478400).

Almost surely, 2^18210739897 is an apocalyptic number.

It is an amenable number.

18210739897 is a deficient number, since it is larger than the sum of its proper divisors (4036223303).

18210739897 is a wasteful number, since it uses less digits than its factorization.

18210739897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010 (or 1003 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 18210739897 in words is "eighteen billion, two hundred ten million, seven hundred thirty-nine thousand, eight hundred ninety-seven".