671377768109 has 4 divisors (see below), whose sum is σ = 694528725660. Its totient is φ = 648226810560.

The previous prime is 671377768099. The next prime is 671377768111. The reversal of 671377768109 is 901867773176.

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

It can be written as a sum of positive squares in 2 ways, for example, as 187722892900 + 483654875209 = 433270^2 + 695453^2 .

It is not a de Polignac number, because 671377768109 - 2¹⁶ = 671377702573 is a prime.

It is a super-2 number, since 2×671377768109² (a number of 24 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 (671377768189) 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, 11575478732 + ... + 11575478789.

It is an arithmetic number, because the mean of its divisors is an integer number (173632181415).

Almost surely, 2^671377768109 is an apocalyptic number.

It is an amenable number.

671377768109 is a deficient number, since it is larger than the sum of its proper divisors (23150957551).

671377768109 is a wasteful number, since it uses less digits than its factorization.

671377768109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23150957550.

The product of its (nonzero) digits is 18670176, while the sum is 62.

The spelling of 671377768109 in words is "six hundred seventy-one billion, three hundred seventy-seven million, seven hundred sixty-eight thousand, one hundred nine".