66756959 has 4 divisors (see below), whose sum is σ = 66796104. Its totient is φ = 66717816.

The previous prime is 66756947. The next prime is 66756961. The reversal of 66756959 is 95965766.

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 66756959 - 2¹⁶ = 66691423 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 66756959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66756359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16892 + ... + 20465.

It is an arithmetic number, because the mean of its divisors is an integer number (16699026).

Almost surely, 2^66756959 is an apocalyptic number.

66756959 is a deficient number, since it is larger than the sum of its proper divisors (39145).

66756959 is a wasteful number, since it uses less digits than its factorization.

66756959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39144.

The product of its digits is 3061800, while the sum is 53.

The square root of 66756959 is about 8170.4931919683. The cubic root of 66756959 is about 405.6631091930.

The spelling of 66756959 in words is "sixty-six million, seven hundred fifty-six thousand, nine hundred fifty-nine".