18869881197 has 4 divisors (see below), whose sum is σ = 25159841600. Its totient is φ = 12579920796.

The previous prime is 18869881159. The next prime is 18869881201. The reversal of 18869881197 is 79118896881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18869881197 - 2¹⁸ = 18869619053 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 (18869881127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3144980197 + ... + 3144980202.

It is an arithmetic number, because the mean of its divisors is an integer number (6289960400).

Almost surely, 2^18869881197 is an apocalyptic number.

It is an amenable number.

18869881197 is a deficient number, since it is larger than the sum of its proper divisors (6289960403).

18869881197 is an equidigital number, since it uses as much as digits as its factorization.

18869881197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289960402.

The product of its digits is 13934592, while the sum is 66.

The spelling of 18869881197 in words is "eighteen billion, eight hundred sixty-nine million, eight hundred eighty-one thousand, one hundred ninety-seven".