63991169493 has 8 divisors (see below), whose sum is σ = 85798216800. Its totient is φ = 42422450928.

The previous prime is 63991169483. The next prime is 63991169507. The reversal of 63991169493 is 39496119936.

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

It is not a de Polignac number, because 63991169493 - 2⁴ = 63991169477 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63991169423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59581558 + ... + 59582631.

It is an arithmetic number, because the mean of its divisors is an integer number (10724777100).

Almost surely, 2^63991169493 is an apocalyptic number.

It is an amenable number.

63991169493 is a deficient number, since it is larger than the sum of its proper divisors (21807047307).

63991169493 is a wasteful number, since it uses less digits than its factorization.

63991169493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119164371.

The product of its digits is 8503056, while the sum is 60.

The spelling of 63991169493 in words is "sixty-three billion, nine hundred ninety-one million, one hundred sixty-nine thousand, four hundred ninety-three".