66427331 has 4 divisors (see below), whose sum is σ = 66457872. Its totient is φ = 66396792.

The previous prime is 66427301. The next prime is 66427337. The reversal of 66427331 is 13372466.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66427331 is a prime.

It is a super-2 number, since 2×66427331² = 8825180607567122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66427337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11735 + ... + 16448.

It is an arithmetic number, because the mean of its divisors is an integer number (16614468).

Almost surely, 2^66427331 is an apocalyptic number.

66427331 is a deficient number, since it is larger than the sum of its proper divisors (30541).

66427331 is a wasteful number, since it uses less digits than its factorization.

66427331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30540.

The product of its digits is 18144, while the sum is 32.

The square root of 66427331 is about 8150.2963749793. The cubic root of 66427331 is about 404.9943219242.

Adding to 66427331 its reverse (13372466), we get a palindrome (79799797).

The spelling of 66427331 in words is "sixty-six million, four hundred twenty-seven thousand, three hundred thirty-one".