671307006561 has 4 divisors (see below), whose sum is σ = 895076008752. Its totient is φ = 447538004372.

The previous prime is 671307006551. The next prime is 671307006613. The reversal of 671307006561 is 165600703176.

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 671307006561 - 2¹⁵ = 671306973793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671307006511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111884501091 + ... + 111884501096.

It is an arithmetic number, because the mean of its divisors is an integer number (223769002188).

Almost surely, 2^671307006561 is an apocalyptic number.

It is an amenable number.

671307006561 is a deficient number, since it is larger than the sum of its proper divisors (223769002191).

671307006561 is a wasteful number, since it uses less digits than its factorization.

671307006561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223769002190.

The product of its (nonzero) digits is 158760, while the sum is 42.

The spelling of 671307006561 in words is "six hundred seventy-one billion, three hundred seven million, six thousand, five hundred sixty-one".