18736221042 has 162 divisors, whose sum is σ = 52030366479. Its totient is φ = 4854936240.

The previous prime is 18736221013. The next prime is 18736221083. The reversal of 18736221042 is 24012263781.

It is a happy number.

18736221042 is a `hidden beast` number, since 1 + 87 + 362 + 210 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9368110521 + 9368110521 = 96789^2 + 96789^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=96789.

It is a junction number, because it is equal to n+sod(n) for n = 18736220988 and 18736221006.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 44716309 + ... + 44716727.

Almost surely, 2^18736221042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18736221042

18736221042 is an abundant number, since it is smaller than the sum of its proper divisors (33294145437).

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

18736221042 is a wasteful number, since it uses less digits than its factorization.

18736221042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

It can be divided in two parts, 18736 and 221042, that added together give a triangular number (239778 = T₆₉₂).

The spelling of 18736221042 in words is "eighteen billion, seven hundred thirty-six million, two hundred twenty-one thousand, forty-two".