66947088491 has 4 divisors (see below), whose sum is σ = 66957723000. Its totient is φ = 66936453984.

The previous prime is 66947088473. The next prime is 66947088511. The reversal of 66947088491 is 19488074966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66947088491 - 2⁶ = 66947088427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66947088431) 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, 5307806 + ... + 5320403.

It is an arithmetic number, because the mean of its divisors is an integer number (16739430750).

Almost surely, 2^66947088491 is an apocalyptic number.

66947088491 is a deficient number, since it is larger than the sum of its proper divisors (10634509).

66947088491 is a wasteful number, since it uses less digits than its factorization.

66947088491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10634508.

The product of its (nonzero) digits is 20901888, while the sum is 62.

The spelling of 66947088491 in words is "sixty-six billion, nine hundred forty-seven million, eighty-eight thousand, four hundred ninety-one".