66331955 has 16 divisors (see below), whose sum is σ = 81016320. Its totient is φ = 52127712.

The previous prime is 66331939. The next prime is 66331997. The reversal of 66331955 is 55913366.

It is a cyclic number.

It is not a de Polignac number, because 66331955 - 2⁴ = 66331939 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120992 + ... + 121538.

It is an arithmetic number, because the mean of its divisors is an integer number (5063520).

Almost surely, 2^66331955 is an apocalyptic number.

66331955 is a deficient number, since it is larger than the sum of its proper divisors (14684365).

66331955 is a wasteful number, since it uses less digits than its factorization.

66331955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938.

The product of its digits is 72900, while the sum is 38.

The square root of 66331955 is about 8144.4431976655. The cubic root of 66331955 is about 404.8003995365.

The spelling of 66331955 in words is "sixty-six million, three hundred thirty-one thousand, nine hundred fifty-five".