66884251 has 8 divisors (see below), whose sum is σ = 77881824. Its totient is φ = 56247360.

The previous prime is 66884249. The next prime is 66884269. The reversal of 66884251 is 15248866.

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

It is a cyclic number.

It is not a de Polignac number, because 66884251 - 2¹ = 66884249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66884231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89770 + ... + 90511.

It is an arithmetic number, because the mean of its divisors is an integer number (9735228).

Almost surely, 2^66884251 is an apocalyptic number.

66884251 is a deficient number, since it is larger than the sum of its proper divisors (10997573).

66884251 is a wasteful number, since it uses less digits than its factorization.

66884251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180341.

The product of its digits is 92160, while the sum is 40.

The square root of 66884251 is about 8178.2792199826. The cubic root of 66884251 is about 405.9207846131.

The spelling of 66884251 in words is "sixty-six million, eight hundred eighty-four thousand, two hundred fifty-one".