63894613791 has 4 divisors (see below), whose sum is σ = 85192818392. Its totient is φ = 42596409192.

The previous prime is 63894613787. The next prime is 63894613799. The reversal of 63894613791 is 19731649836.

It is a happy number.

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

It is not a de Polignac number, because 63894613791 - 2² = 63894613787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63894613799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10649102296 + ... + 10649102301.

It is an arithmetic number, because the mean of its divisors is an integer number (21298204598).

Almost surely, 2^63894613791 is an apocalyptic number.

63894613791 is a deficient number, since it is larger than the sum of its proper divisors (21298204601).

63894613791 is a wasteful number, since it uses less digits than its factorization.

63894613791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21298204600.

The product of its digits is 5878656, while the sum is 57.

The spelling of 63894613791 in words is "sixty-three billion, eight hundred ninety-four million, six hundred thirteen thousand, seven hundred ninety-one".