66808959 has 16 divisors (see below), whose sum is σ = 107162880. Its totient is φ = 36167040.

The previous prime is 66808927. The next prime is 66808961. The reversal of 66808959 is 95980866.

It is not a de Polignac number, because 66808959 - 2⁵ = 66808927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66808909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83322 + ... + 84119.

It is an arithmetic number, because the mean of its divisors is an integer number (6697680).

Almost surely, 2^66808959 is an apocalyptic number.

66808959 is a deficient number, since it is larger than the sum of its proper divisors (40353921).

66808959 is a wasteful number, since it uses less digits than its factorization.

66808959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167470.

The product of its (nonzero) digits is 933120, while the sum is 51.

The square root of 66808959 is about 8173.6747549679. The cubic root of 66808959 is about 405.7684116075.

The spelling of 66808959 in words is "sixty-six million, eight hundred eight thousand, nine hundred fifty-nine".