66387478367 has 4 divisors (see below), whose sum is σ = 75871403856. Its totient is φ = 56903552880.

The previous prime is 66387478363. The next prime is 66387478373. The reversal of 66387478367 is 76387478366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76387478366 = 2 ⋅38193739183.

It is a cyclic number.

It is not a de Polignac number, because 66387478367 - 2² = 66387478363 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66387478363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4741962734 + ... + 4741962747.

It is an arithmetic number, because the mean of its divisors is an integer number (18967850964).

Almost surely, 2^66387478367 is an apocalyptic number.

66387478367 is a deficient number, since it is larger than the sum of its proper divisors (9483925489).

66387478367 is an equidigital number, since it uses as much as digits as its factorization.

66387478367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9483925488.

The product of its digits is 170698752, while the sum is 65.

Subtracting 66387478367 from its reverse (76387478366), we obtain a palindrome (9999999999).

The spelling of 66387478367 in words is "sixty-six billion, three hundred eighty-seven million, four hundred seventy-eight thousand, three hundred sixty-seven".