66885231 has 8 divisors (see below), whose sum is σ = 101920384. Its totient is φ = 38220120.

The previous prime is 66885211. The next prime is 66885349. The reversal of 66885231 is 13258866.

It is a happy number.

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

It is not a de Polignac number, because 66885231 - 2¹³ = 66877039 is a prime.

It is a super-2 number, since 2×66885231² = 8947268251846722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66885231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66885211) 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, 1592485 + ... + 1592526.

It is an arithmetic number, because the mean of its divisors is an integer number (12740048).

Almost surely, 2^66885231 is an apocalyptic number.

66885231 is a deficient number, since it is larger than the sum of its proper divisors (35035153).

66885231 is a wasteful number, since it uses less digits than its factorization.

66885231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3185021.

The product of its digits is 69120, while the sum is 39.

The square root of 66885231 is about 8178.3391345676. The cubic root of 66885231 is about 405.9227671447.

The spelling of 66885231 in words is "sixty-six million, eight hundred eighty-five thousand, two hundred thirty-one".