66557230 has 8 divisors (see below), whose sum is σ = 119803032. Its totient is φ = 26622888.

The previous prime is 66557221. The next prime is 66557237. The reversal of 66557230 is 3275566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66557237) by changing a digit.

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, 3327852 + ... + 3327871.

It is an arithmetic number, because the mean of its divisors is an integer number (14975379).

Almost surely, 2^66557230 is an apocalyptic number.

66557230 is a deficient number, since it is larger than the sum of its proper divisors (53245802).

66557230 is a wasteful number, since it uses less digits than its factorization.

66557230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6655730.

The product of its (nonzero) digits is 37800, while the sum is 34.

The square root of 66557230 is about 8158.2614569527. The cubic root of 66557230 is about 405.2581395519.

The spelling of 66557230 in words is "sixty-six million, five hundred fifty-seven thousand, two hundred thirty".