66508761 has 8 divisors (see below), whose sum is σ = 96740064. Its totient is φ = 40308320.

The previous prime is 66508751. The next prime is 66508763. The reversal of 66508761 is 16780566.

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 66508761 - 2⁷ = 66508633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66508763) 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, 1007676 + ... + 1007741.

It is an arithmetic number, because the mean of its divisors is an integer number (12092508).

Almost surely, 2^66508761 is an apocalyptic number.

It is an amenable number.

66508761 is a deficient number, since it is larger than the sum of its proper divisors (30231303).

66508761 is a wasteful number, since it uses less digits than its factorization.

66508761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015431.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 66508761 is about 8155.2903688342. The cubic root of 66508761 is about 405.1597418934.

The spelling of 66508761 in words is "sixty-six million, five hundred eight thousand, seven hundred sixty-one".