671765434243 has 4 divisors (see below), whose sum is σ = 711281048040. Its totient is φ = 632249820448.

The previous prime is 671765434231. The next prime is 671765434247. The reversal of 671765434243 is 342434567176.

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 671765434243 - 2⁵ = 671765434211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671765434247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19757806873 + ... + 19757806906.

It is an arithmetic number, because the mean of its divisors is an integer number (177820262010).

Almost surely, 2^671765434243 is an apocalyptic number.

671765434243 is a deficient number, since it is larger than the sum of its proper divisors (39515613797).

671765434243 is a wasteful number, since it uses less digits than its factorization.

671765434243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39515613796.

The product of its digits is 10160640, while the sum is 52.

The spelling of 671765434243 in words is "six hundred seventy-one billion, seven hundred sixty-five million, four hundred thirty-four thousand, two hundred forty-three".