156681818442 has 24 divisors (see below), whose sum is σ = 339534021216. Its totient is φ = 52218542376.

The previous prime is 156681818429. The next prime is 156681818459. The reversal of 156681818442 is 244818186651.

156681818442 is a `hidden beast` number, since 15 + 6 + 6 + 8 + 181 + 8 + 442 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 616408 + ... + 832659.

It is an arithmetic number, because the mean of its divisors is an integer number (14147250884).

Almost surely, 2^156681818442 is an apocalyptic number.

156681818442 is an abundant number, since it is smaller than the sum of its proper divisors (182852202774).

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

156681818442 is a wasteful number, since it uses less digits than its factorization.

156681818442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455082 (or 1455079 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 54.

The spelling of 156681818442 in words is "one hundred fifty-six billion, six hundred eighty-one million, eight hundred eighteen thousand, four hundred forty-two".