18420774871578 has 16 divisors (see below), whose sum is σ = 38443356254016. Its totient is φ = 5873290538720.

The previous prime is 18420774871567. The next prime is 18420774871579. The reversal of 18420774871578 is 87517847702481.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18420774871579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66741937803 + ... + 66741938078.

It is an arithmetic number, because the mean of its divisors is an integer number (2402709765876).

Almost surely, 2^{18420774871578} is an apocalyptic number.

18420774871578 is an abundant number, since it is smaller than the sum of its proper divisors (20022581382438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18420774871578 is a wasteful number, since it uses less digits than its factorization.

18420774871578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133483875909.

The product of its (nonzero) digits is 196689920, while the sum is 69.

The spelling of 18420774871578 in words is "eighteen trillion, four hundred twenty billion, seven hundred seventy-four million, eight hundred seventy-one thousand, five hundred seventy-eight".