66403787187 has 18 divisors (see below), whose sum is σ = 91018621764. Its totient is φ = 43062014880.

The previous prime is 66403787179. The next prime is 66403787269. The reversal of 66403787187 is 78178730466.

It is not a de Polignac number, because 66403787187 - 2³ = 66403787179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66403780187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16512237 + ... + 16516257.

It is an arithmetic number, because the mean of its divisors is an integer number (5056590098).

Almost surely, 2^66403787187 is an apocalyptic number.

66403787187 is a deficient number, since it is larger than the sum of its proper divisors (24614834577).

66403787187 is an frugal number, since it uses more digits than its factorization.

66403787187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8119 (or 4061 counting only the distinct ones).

The product of its (nonzero) digits is 9483264, while the sum is 57.

The spelling of 66403787187 in words is "sixty-six billion, four hundred three million, seven hundred eighty-seven thousand, one hundred eighty-seven".