63981140069 has 16 divisors (see below), whose sum is σ = 80099707776. Its totient is φ = 49648550400.

The previous prime is 63981140059. The next prime is 63981140099. The reversal of 63981140069 is 96004118936.

It is a cyclic number.

It is not a de Polignac number, because 63981140069 - 2²⁰ = 63980091493 is a prime.

It is a super-2 number, since 2×63981140069² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63981140039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1705352 + ... + 1742465.

It is an arithmetic number, because the mean of its divisors is an integer number (5006231736).

Almost surely, 2^63981140069 is an apocalyptic number.

It is an amenable number.

63981140069 is a deficient number, since it is larger than the sum of its proper divisors (16118567707).

63981140069 is a wasteful number, since it uses less digits than its factorization.

63981140069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3448076.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 63981140069 in words is "sixty-three billion, nine hundred eighty-one million, one hundred forty thousand, sixty-nine".