66808807 has 16 divisors (see below), whose sum is σ = 76174560. Its totient is φ = 58084992.

The previous prime is 66808783. The next prime is 66808831. The reversal of 66808807 is 70880866.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66808783) and next prime (66808831).

It is a cyclic number.

It is not a de Polignac number, because 66808807 - 2²³ = 58420199 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 (66808867) 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, 47973 + ... + 49345.

It is an arithmetic number, because the mean of its divisors is an integer number (4760910).

Almost surely, 2^66808807 is an apocalyptic number.

66808807 is a deficient number, since it is larger than the sum of its proper divisors (9365753).

66808807 is a wasteful number, since it uses less digits than its factorization.

66808807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 66808807 is about 8173.6654568192. The cubic root of 66808807 is about 405.7681038801.

The spelling of 66808807 in words is "sixty-six million, eight hundred eight thousand, eight hundred seven".