66771231 has 8 divisors (see below), whose sum is σ = 92899200. Its totient is φ = 42578712.

The previous prime is 66771203. The next prime is 66771251. The reversal of 66771231 is 13217766.

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

It is not a de Polignac number, because 66771231 - 2⁶ = 66771167 is a prime.

It is a super-2 number, since 2×66771231² = 8916794578510722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66771192 and 66771201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66771251) 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, 483781 + ... + 483918.

It is an arithmetic number, because the mean of its divisors is an integer number (11612400).

Almost surely, 2^66771231 is an apocalyptic number.

66771231 is a deficient number, since it is larger than the sum of its proper divisors (26127969).

66771231 is a wasteful number, since it uses less digits than its factorization.

66771231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 967725.

The product of its digits is 10584, while the sum is 33.

The square root of 66771231 is about 8171.3665319823. The cubic root of 66771231 is about 405.6920160987.

Adding to 66771231 its reverse (13217766), we get a palindrome (79988997).

The spelling of 66771231 in words is "sixty-six million, seven hundred seventy-one thousand, two hundred thirty-one".