66748899 has 16 divisors (see below), whose sum is σ = 101986560. Its totient is φ = 38039520.

The previous prime is 66748897. The next prime is 66748909. The reversal of 66748899 is 99884766.

It is a Cunningham number, because it is equal to 8170²-1.

It is not a de Polignac number, because 66748899 - 2¹ = 66748897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66748897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4084 + ... + 12254.

It is an arithmetic number, because the mean of its divisors is an integer number (6374160).

Almost surely, 2^66748899 is an apocalyptic number.

66748899 is a deficient number, since it is larger than the sum of its proper divisors (35237661).

66748899 is a wasteful number, since it uses less digits than its factorization.

66748899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8570.

The product of its digits is 5225472, while the sum is 57.

The square root of 66748899 is about 8169.9999388005. Note that the first 4 decimals coincide. The cubic root of 66748899 is about 405.6467824245.

The spelling of 66748899 in words is "sixty-six million, seven hundred forty-eight thousand, eight hundred ninety-nine".