647167581671 has 8 divisors (see below), whose sum is σ = 696958449264. Its totient is φ = 597377963520.

The previous prime is 647167581659. The next prime is 647167581701. The reversal of 647167581671 is 176185761746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 647167581671 - 2²⁶ = 647100472807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647167581671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647167581971) 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 7 ways as a sum of consecutive naturals, for example, 953420 + ... + 1484366.

It is an arithmetic number, because the mean of its divisors is an integer number (87119806158).

Almost surely, 2^647167581671 is an apocalyptic number.

647167581671 is a deficient number, since it is larger than the sum of its proper divisors (49790867593).

647167581671 is a wasteful number, since it uses less digits than its factorization.

647167581671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624721.

The product of its digits is 11854080, while the sum is 59.

The spelling of 647167581671 in words is "six hundred forty-seven billion, one hundred sixty-seven million, five hundred eighty-one thousand, six hundred seventy-one".