66615431342231 has 8 divisors (see below), whose sum is σ = 67464131879760. Its totient is φ = 65771049892032.

The previous prime is 66615431342227. The next prime is 66615431342237. The reversal of 66615431342231 is 13224313451666.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66615431342231 - 2² = 66615431342227 is a prime.

It is a super-2 number, since 2×66615431342231² (a number of 28 digits) 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 (66615431342237) 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, 1079740790 + ... + 1079802483.

It is an arithmetic number, because the mean of its divisors is an integer number (8433016484970).

Almost surely, 2^{66615431342231} is an apocalyptic number.

66615431342231 is a deficient number, since it is larger than the sum of its proper divisors (848700537529).

66615431342231 is a wasteful number, since it uses less digits than its factorization.

66615431342231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159543665.

The product of its digits is 1866240, while the sum is 47.

Adding to 66615431342231 its reverse (13224313451666), we get a palindrome (79839744793897).

The spelling of 66615431342231 in words is "sixty-six trillion, six hundred fifteen billion, four hundred thirty-one million, three hundred forty-two thousand, two hundred thirty-one".