66598947 has 6 divisors (see below), whose sum is σ = 96198492. Its totient is φ = 44399292.

The previous prime is 66598937. The next prime is 66598949. The reversal of 66598947 is 74989566.

66598947 is a `hidden beast` number, since 6 + 6 + 598 + 9 + 47 = 666.

66598947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-66598947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66598893 and 66598902.

It is not an unprimeable number, because it can be changed into a prime (66598949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3699933 + ... + 3699950.

It is an arithmetic number, because the mean of its divisors is an integer number (16033082).

Almost surely, 2^66598947 is an apocalyptic number.

66598947 is a deficient number, since it is larger than the sum of its proper divisors (29599545).

66598947 is a wasteful number, since it uses less digits than its factorization.

66598947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7399889 (or 7399886 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 66598947 is about 8160.8177899032. The cubic root of 66598947 is about 405.3427916269.

The spelling of 66598947 in words is "sixty-six million, five hundred ninety-eight thousand, nine hundred forty-seven".