63847356036671 has 4 divisors (see below), whose sum is σ = 63847396935000. Its totient is φ = 63847315138344.

The previous prime is 63847356036647. The next prime is 63847356036743. The reversal of 63847356036671 is 17663065374836.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63847356036671 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63847356036598 and 63847356036607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63847356036631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18010541 + ... + 21262038.

It is an arithmetic number, because the mean of its divisors is an integer number (15961849233750).

Almost surely, 2^{63847356036671} is an apocalyptic number.

63847356036671 is a deficient number, since it is larger than the sum of its proper divisors (40898329).

63847356036671 is a wasteful number, since it uses less digits than its factorization.

63847356036671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40898328.

The product of its (nonzero) digits is 274337280, while the sum is 65.

The spelling of 63847356036671 in words is "sixty-three trillion, eight hundred forty-seven billion, three hundred fifty-six million, thirty-six thousand, six hundred seventy-one".