66396855 has 16 divisors (see below), whose sum is σ = 121411584. Its totient is φ = 30352800.

The previous prime is 66396851. The next prime is 66396877. The reversal of 66396855 is 55869366.

It is not a de Polignac number, because 66396855 - 2² = 66396851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66396851) 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, 316071 + ... + 316280.

It is an arithmetic number, because the mean of its divisors is an integer number (7588224).

Almost surely, 2^66396855 is an apocalyptic number.

66396855 is a deficient number, since it is larger than the sum of its proper divisors (55014729).

66396855 is a wasteful number, since it uses less digits than its factorization.

66396855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632366.

The product of its digits is 1166400, while the sum is 48.

The square root of 66396855 is about 8148.4265352275. The cubic root of 66396855 is about 404.9323770650.

The spelling of 66396855 in words is "sixty-six million, three hundred ninety-six thousand, eight hundred fifty-five".