18405120245123 has 16 divisors (see below), whose sum is σ = 19492303864320. Its totient is φ = 17329812535296.

The previous prime is 18405120245117. The next prime is 18405120245131. The reversal of 18405120245123 is 32154202150481.

It is a cyclic number.

It is not a de Polignac number, because 18405120245123 - 2⁶ = 18405120245059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18405120245023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24818690 + ... + 25549512.

It is an arithmetic number, because the mean of its divisors is an integer number (1218268991520).

Almost surely, 2^{18405120245123} is an apocalyptic number.

18405120245123 is a deficient number, since it is larger than the sum of its proper divisors (1087183619197).

18405120245123 is a wasteful number, since it uses less digits than its factorization.

18405120245123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738946.

The product of its (nonzero) digits is 76800, while the sum is 38.

The spelling of 18405120245123 in words is "eighteen trillion, four hundred five billion, one hundred twenty million, two hundred forty-five thousand, one hundred twenty-three".