671344778579 has 4 divisors (see below), whose sum is σ = 694494598560. Its totient is φ = 648194958600.

The previous prime is 671344778543. The next prime is 671344778603. The reversal of 671344778579 is 975877443176.

671344778579 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 671344778579 - 2¹² = 671344774483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671344778519) 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, 11574909947 + ... + 11574910004.

It is an arithmetic number, because the mean of its divisors is an integer number (173623649640).

Almost surely, 2^671344778579 is an apocalyptic number.

671344778579 is a deficient number, since it is larger than the sum of its proper divisors (23149819981).

671344778579 is a wasteful number, since it uses less digits than its factorization.

671344778579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23149819980.

The product of its digits is 248935680, while the sum is 68.

The spelling of 671344778579 in words is "six hundred seventy-one billion, three hundred forty-four million, seven hundred seventy-eight thousand, five hundred seventy-nine".