18985635942 has 48 divisors (see below), whose sum is σ = 47568416112. Its totient is φ = 5007199680.

The previous prime is 18985635941. The next prime is 18985635997. The reversal of 18985635942 is 24953658981.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18985635941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2479909 + ... + 2487552.

It is an arithmetic number, because the mean of its divisors is an integer number (991008669).

Almost surely, 2^18985635942 is an apocalyptic number.

18985635942 is an abundant number, since it is smaller than the sum of its proper divisors (28582780170).

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

18985635942 is a wasteful number, since it uses less digits than its factorization.

18985635942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4967493 (or 4967486 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 60.

The spelling of 18985635942 in words is "eighteen billion, nine hundred eighty-five million, six hundred thirty-five thousand, nine hundred forty-two".