63994373481 has 8 divisors (see below), whose sum is σ = 85567548960. Its totient is φ = 42542056832.

The previous prime is 63994373479. The next prime is 63994373489. The reversal of 63994373481 is 18437349936.

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

It is a cyclic number.

It is not a de Polignac number, because 63994373481 - 2¹ = 63994373479 is a prime.

It is a super-2 number, since 2×63994373481² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63994373489) 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, 30213471 + ... + 30215588.

It is an arithmetic number, because the mean of its divisors is an integer number (10695943620).

Almost surely, 2^63994373481 is an apocalyptic number.

It is an amenable number.

63994373481 is a deficient number, since it is larger than the sum of its proper divisors (21573175479).

63994373481 is a wasteful number, since it uses less digits than its factorization.

63994373481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60429415.

The product of its digits is 11757312, while the sum is 57.

The spelling of 63994373481 in words is "sixty-three billion, nine hundred ninety-four million, three hundred seventy-three thousand, four hundred eighty-one".