66231455 has 4 divisors (see below), whose sum is σ = 79477752. Its totient is φ = 52985160.

The previous prime is 66231437. The next prime is 66231461. The reversal of 66231455 is 55413266.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66231455 - 2⁶ = 66231391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6623141 + ... + 6623150.

It is an arithmetic number, because the mean of its divisors is an integer number (19869438).

Almost surely, 2^66231455 is an apocalyptic number.

66231455 is a deficient number, since it is larger than the sum of its proper divisors (13246297).

66231455 is a wasteful number, since it uses less digits than its factorization.

66231455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13246296.

The product of its digits is 21600, while the sum is 32.

The square root of 66231455 is about 8138.2710080213. The cubic root of 66231455 is about 404.5958575801.

The spelling of 66231455 in words is "sixty-six million, two hundred thirty-one thousand, four hundred fifty-five".