66708951 has 8 divisors (see below), whose sum is σ = 89236224. Its totient is φ = 44327160.

The previous prime is 66708949. The next prime is 66708977. The reversal of 66708951 is 15980766.

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

It is not a de Polignac number, because 66708951 - 2¹ = 66708949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66708911) 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, 35295 + ... + 37136.

It is an arithmetic number, because the mean of its divisors is an integer number (11154528).

Almost surely, 2^66708951 is an apocalyptic number.

66708951 is a deficient number, since it is larger than the sum of its proper divisors (22527273).

66708951 is a wasteful number, since it uses less digits than its factorization.

66708951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72741.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 66708951 is about 8167.5547748393. The cubic root of 66708951 is about 405.5658422055.

The spelling of 66708951 in words is "sixty-six million, seven hundred eight thousand, nine hundred fifty-one".