671322271523 has 4 divisors (see below), whose sum is σ = 672963646680. Its totient is φ = 669680896368.

The previous prime is 671322271517. The next prime is 671322271553. The reversal of 671322271523 is 325172223176.

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 671322271523 - 2⁸ = 671322271267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671322271553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820686965 + ... + 820687782.

It is an arithmetic number, because the mean of its divisors is an integer number (168240911670).

Almost surely, 2^671322271523 is an apocalyptic number.

671322271523 is a deficient number, since it is larger than the sum of its proper divisors (1641375157).

671322271523 is a wasteful number, since it uses less digits than its factorization.

671322271523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641375156.

The product of its digits is 211680, while the sum is 41.

Adding to 671322271523 its reverse (325172223176), we get a palindrome (996494494699).

The spelling of 671322271523 in words is "six hundred seventy-one billion, three hundred twenty-two million, two hundred seventy-one thousand, five hundred twenty-three".