18407183897 has 4 divisors (see below), whose sum is σ = 18443779200. Its totient is φ = 18370588596.

The previous prime is 18407183827. The next prime is 18407183939. The reversal of 18407183897 is 79838170481.

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 a cyclic number.

It is not a de Polignac number, because 18407183897 - 2¹² = 18407179801 is a prime.

It is a super-2 number, since 2×18407183897² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18407183807) 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, 18296897 + ... + 18297902.

It is an arithmetic number, because the mean of its divisors is an integer number (4610944800).

Almost surely, 2^18407183897 is an apocalyptic number.

It is an amenable number.

18407183897 is a deficient number, since it is larger than the sum of its proper divisors (36595303).

18407183897 is an equidigital number, since it uses as much as digits as its factorization.

18407183897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36595302.

The product of its (nonzero) digits is 2709504, while the sum is 56.

The spelling of 18407183897 in words is "eighteen billion, four hundred seven million, one hundred eighty-three thousand, eight hundred ninety-seven".