671321020109 has 4 divisors (see below), whose sum is σ = 671586262080. Its totient is φ = 671055778140.

The previous prime is 671321020093. The next prime is 671321020127. The reversal of 671321020109 is 901020123176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 671321020109 - 2⁴ = 671321020093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671321020199) 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, 132617189 + ... + 132622250.

It is an arithmetic number, because the mean of its divisors is an integer number (167896565520).

Almost surely, 2^671321020109 is an apocalyptic number.

It is an amenable number.

671321020109 is a deficient number, since it is larger than the sum of its proper divisors (265241971).

671321020109 is a wasteful number, since it uses less digits than its factorization.

671321020109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265241970.

The product of its (nonzero) digits is 4536, while the sum is 32.

The spelling of 671321020109 in words is "six hundred seventy-one billion, three hundred twenty-one million, twenty thousand, one hundred nine".