666531241771 has 4 divisors (see below), whose sum is σ = 666546151600. Its totient is φ = 666516331944.

The previous prime is 666531241757. The next prime is 666531241889. The reversal of 666531241771 is 177142135666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666531241771 - 2⁷ = 666531241643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666531241471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7387656 + ... + 7477333.

It is an arithmetic number, because the mean of its divisors is an integer number (166636537900).

Almost surely, 2^666531241771 is an apocalyptic number.

666531241771 is a deficient number, since it is larger than the sum of its proper divisors (14909829).

666531241771 is a wasteful number, since it uses less digits than its factorization.

666531241771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14909828.

The product of its digits is 1270080, while the sum is 49.

The spelling of 666531241771 in words is "six hundred sixty-six billion, five hundred thirty-one million, two hundred forty-one thousand, seven hundred seventy-one".