66942231 has 8 divisors (see below), whose sum is σ = 89342064. Its totient is φ = 44585280.

The previous prime is 66942229. The next prime is 66942247. The reversal of 66942231 is 13224966.

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

It is not a de Polignac number, because 66942231 - 2¹ = 66942229 is a prime.

It is a super-2 number, since 2×66942231² = 8962524582514722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66942192 and 66942201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66942221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6880 + ... + 13461.

It is an arithmetic number, because the mean of its divisors is an integer number (11167758).

Almost surely, 2^66942231 is an apocalyptic number.

66942231 is a deficient number, since it is larger than the sum of its proper divisors (22399833).

66942231 is a wasteful number, since it uses less digits than its factorization.

66942231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21441.

The product of its digits is 15552, while the sum is 33.

The square root of 66942231 is about 8181.8232075742. The cubic root of 66942231 is about 406.0380443533.

The spelling of 66942231 in words is "sixty-six million, nine hundred forty-two thousand, two hundred thirty-one".