18000377442 has 80 divisors (see below), whose sum is σ = 40700721600. Its totient is φ = 5945863968.

The previous prime is 18000377431. The next prime is 18000377513. The reversal of 18000377442 is 24477300081.

It is a happy number.

18000377442 is a `hidden beast` number, since 180 + 0 + 0 + 37 + 7 + 442 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18000377397 and 18000377406.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9122368 + ... + 9124340.

It is an arithmetic number, because the mean of its divisors is an integer number (508759020).

Almost surely, 2^18000377442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18000377442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20350360800).

18000377442 is an abundant number, since it is smaller than the sum of its proper divisors (22700344158).

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

18000377442 is a wasteful number, since it uses less digits than its factorization.

18000377442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469 (or 2460 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The spelling of 18000377442 in words is "eighteen billion, three hundred seventy-seven thousand, four hundred forty-two".