671856956363 has 4 divisors (see below), whose sum is σ = 672327775560. Its totient is φ = 671386137168.

The previous prime is 671856956359. The next prime is 671856956371. The reversal of 671856956363 is 363659658176.

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

It is a cyclic number.

It is not a de Polignac number, because 671856956363 - 2² = 671856956359 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 671856956363.

It is not an unprimeable number, because it can be changed into a prime (671856956263) 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, 235407458 + ... + 235410311.

It is an arithmetic number, because the mean of its divisors is an integer number (168081943890).

Almost surely, 2^671856956363 is an apocalyptic number.

671856956363 is a deficient number, since it is larger than the sum of its proper divisors (470819197).

671856956363 is a wasteful number, since it uses less digits than its factorization.

671856956363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470819196.

The product of its digits is 146966400, while the sum is 65.

The spelling of 671856956363 in words is "six hundred seventy-one billion, eight hundred fifty-six million, nine hundred fifty-six thousand, three hundred sixty-three".