66966251 has 8 divisors (see below), whose sum is σ = 73113600. Its totient is φ = 60828840.

The previous prime is 66966223. The next prime is 66966253. The reversal of 66966251 is 15266966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66966251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66966199 and 66966208.

It is not an unprimeable number, because it can be changed into a prime (66966253) 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 7 ways as a sum of consecutive naturals, for example, 23270 + ... + 25988.

It is an arithmetic number, because the mean of its divisors is an integer number (9139200).

Almost surely, 2^66966251 is an apocalyptic number.

66966251 is a deficient number, since it is larger than the sum of its proper divisors (6147349).

66966251 is a wasteful number, since it uses less digits than its factorization.

66966251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4969.

The product of its digits is 116640, while the sum is 41.

The square root of 66966251 is about 8183.2909639093. The cubic root of 66966251 is about 406.0866029756.

The spelling of 66966251 in words is "sixty-six million, nine hundred sixty-six thousand, two hundred fifty-one".