66733951 has 4 divisors (see below), whose sum is σ = 66769272. Its totient is φ = 66698632.

The previous prime is 66733861. The next prime is 66733967. The reversal of 66733951 is 15933766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66733951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66733151) 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 3 ways as a sum of consecutive naturals, for example, 14656 + ... + 18661.

It is an arithmetic number, because the mean of its divisors is an integer number (16692318).

Almost surely, 2^66733951 is an apocalyptic number.

66733951 is a deficient number, since it is larger than the sum of its proper divisors (35321).

66733951 is a wasteful number, since it uses less digits than its factorization.

66733951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35320.

The product of its digits is 102060, while the sum is 40.

The square root of 66733951 is about 8169.0850772899. The cubic root of 66733951 is about 405.6164994740.

The spelling of 66733951 in words is "sixty-six million, seven hundred thirty-three thousand, nine hundred fifty-one".