66683251 has 4 divisors (see below), whose sum is σ = 66726504. Its totient is φ = 66640000.

The previous prime is 66683219. The next prime is 66683269. The reversal of 66683251 is 15238666.

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 66683251 - 2⁵ = 66683219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66683251.

It is not an unprimeable number, because it can be changed into a prime (66683051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19225 + ... + 22426.

It is an arithmetic number, because the mean of its divisors is an integer number (16681626).

Almost surely, 2^66683251 is an apocalyptic number.

66683251 is a deficient number, since it is larger than the sum of its proper divisors (43253).

66683251 is a wasteful number, since it uses less digits than its factorization.

66683251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43252.

The product of its digits is 51840, while the sum is 37.

The square root of 66683251 is about 8165.9813249848. The cubic root of 66683251 is about 405.5137533390.

The spelling of 66683251 in words is "sixty-six million, six hundred eighty-three thousand, two hundred fifty-one".