66386955 has 32 divisors (see below), whose sum is σ = 113016384. Its totient is φ = 33161216.

The previous prime is 66386953. The next prime is 66386959. The reversal of 66386955 is 55968366.

It is a cyclic number.

It is not a de Polignac number, because 66386955 - 2¹ = 66386953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66386951) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65029 + ... + 66041.

It is an arithmetic number, because the mean of its divisors is an integer number (3531762).

Almost surely, 2^66386955 is an apocalyptic number.

66386955 is a deficient number, since it is larger than the sum of its proper divisors (46629429).

66386955 is a wasteful number, since it uses less digits than its factorization.

66386955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295.

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

The square root of 66386955 is about 8147.8190333365. The cubic root of 66386955 is about 404.9122504602.

The spelling of 66386955 in words is "sixty-six million, three hundred eighty-six thousand, nine hundred fifty-five".