201818159442 has 64 divisors (see below), whose sum is σ = 449445024000. Its totient is φ = 67128868224.

The previous prime is 201818159393. The next prime is 201818159503. The reversal of 201818159442 is 244951818102.

201818159442 is a `hidden beast` number, since 2 + 0 + 1 + 8 + 18 + 1 + 594 + 42 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93737038 + ... + 93739190.

It is an arithmetic number, because the mean of its divisors is an integer number (7022578500).

Almost surely, 2^201818159442 is an apocalyptic number.

201818159442 is an abundant number, since it is smaller than the sum of its proper divisors (247626864558).

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

201818159442 is a wasteful number, since it uses less digits than its factorization.

201818159442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5072 (or 5066 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 201818159442 in words is "two hundred one billion, eight hundred eighteen million, one hundred fifty-nine thousand, four hundred forty-two".