671201672065 has 4 divisors (see below), whose sum is σ = 805442006484. Its totient is φ = 536961337648.

The previous prime is 671201672059. The next prime is 671201672107. The reversal of 671201672065 is 560276102176.

671201672065 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 can be written as a sum of positive squares in 2 ways, for example, as 456700233616 + 214501438449 = 675796^2 + 463143^2 .

It is a cyclic number.

It is not a de Polignac number, because 671201672065 - 2²³ = 671193283457 is a prime.

It is a super-3 number, since 3×671201672065³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67120167202 + ... + 67120167211.

It is an arithmetic number, because the mean of its divisors is an integer number (201360501621).

Almost surely, 2^671201672065 is an apocalyptic number.

It is an amenable number.

671201672065 is a deficient number, since it is larger than the sum of its proper divisors (134240334419).

671201672065 is a wasteful number, since it uses less digits than its factorization.

671201672065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134240334418.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 671201672065 in words is "six hundred seventy-one billion, two hundred one million, six hundred seventy-two thousand, sixty-five".