66797865 has 80 divisors (see below), whose sum is σ = 127961856. Its totient is φ = 33264000.

The previous prime is 66797833. The next prime is 66797891. The reversal of 66797865 is 56879766.

It is a happy number.

It is not a de Polignac number, because 66797865 - 2⁵ = 66797833 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 661315 + ... + 661415.

Almost surely, 2^66797865 is an apocalyptic number.

It is an amenable number.

66797865 is a deficient number, since it is larger than the sum of its proper divisors (61163991).

66797865 is a wasteful number, since it uses less digits than its factorization.

66797865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 203 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The square root of 66797865 is about 8172.9960846681. The cubic root of 66797865 is about 405.7459503288.

The spelling of 66797865 in words is "sixty-six million, seven hundred ninety-seven thousand, eight hundred sixty-five".