66761231 has 8 divisors (see below), whose sum is σ = 70560000. Its totient is φ = 62991000.

The previous prime is 66761221. The next prime is 66761237. The reversal of 66761231 is 13216766.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66761231 is a prime.

It is a super-2 number, since 2×66761231² = 8914123929270722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66761237) 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, 2231 + ... + 11768.

It is an arithmetic number, because the mean of its divisors is an integer number (8820000).

Almost surely, 2^66761231 is an apocalyptic number.

66761231 is a deficient number, since it is larger than the sum of its proper divisors (3798769).

66761231 is a wasteful number, since it uses less digits than its factorization.

66761231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14269.

The product of its digits is 9072, while the sum is 32.

The square root of 66761231 is about 8170.7546163130. The cubic root of 66761231 is about 405.6717622526.

Adding to 66761231 its reverse (13216766), we get a palindrome (79977997).

The spelling of 66761231 in words is "sixty-six million, seven hundred sixty-one thousand, two hundred thirty-one".