66187851438 has 8 divisors (see below), whose sum is σ = 132375702888. Its totient is φ = 22062617144.

The previous prime is 66187851403. The next prime is 66187851439. The reversal of 66187851438 is 83415878166.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

66187851438 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66187851439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5515654281 + ... + 5515654292.

It is an arithmetic number, because the mean of its divisors is an integer number (16546962861).

Almost surely, 2^66187851438 is an apocalyptic number.

66187851438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66187851438 is a wasteful number, since it uses less digits than its factorization.

66187851438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11031308578.

The product of its digits is 7741440, while the sum is 57.

The spelling of 66187851438 in words is "sixty-six billion, one hundred eighty-seven million, eight hundred fifty-one thousand, four hundred thirty-eight".