18405912097 has 4 divisors (see below), whose sum is σ = 18797527296. Its totient is φ = 18014296900.

The previous prime is 18405912059. The next prime is 18405912137. The reversal of 18405912097 is 79021950481.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79021950481 = 283 ⋅279229507.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18405912097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18405912037) 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, 195807529 + ... + 195807622.

It is an arithmetic number, because the mean of its divisors is an integer number (4699381824).

Almost surely, 2^18405912097 is an apocalyptic number.

It is an amenable number.

18405912097 is a deficient number, since it is larger than the sum of its proper divisors (391615199).

18405912097 is an equidigital number, since it uses as much as digits as its factorization.

18405912097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391615198.

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 18405912097 in words is "eighteen billion, four hundred five million, nine hundred twelve thousand, ninety-seven".