42451189866 has 24 divisors (see below), whose sum is σ = 92023257924. Its totient is φ = 14143368960.

The previous prime is 42451189849. The next prime is 42451189871. The reversal of 42451189866 is 66898115424.

42451189866 is a `hidden beast` number, since 4 + 2 + 451 + 189 + 8 + 6 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 42344996841 + 106193025 = 205779^2 + 10305^2 .

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, 548325 + ... + 620936.

Almost surely, 2^42451189866 is an apocalyptic number.

42451189866 is an abundant number, since it is smaller than the sum of its proper divisors (49572068058).

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

42451189866 is a wasteful number, since it uses less digits than its factorization.

42451189866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171286 (or 1171283 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The spelling of 42451189866 in words is "forty-two billion, four hundred fifty-one million, one hundred eighty-nine thousand, eight hundred sixty-six".