63993939361 has 8 divisors (see below), whose sum is σ = 69816399264. Its totient is φ = 58172284320.

The previous prime is 63993939227. The next prime is 63993939371. The reversal of 63993939361 is 16393939936.

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 63993939361 - 2²¹ = 63991842209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63993939361.

It is not an unprimeable number, because it can be changed into a prime (63993939371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28515 + ... + 358888.

It is an arithmetic number, because the mean of its divisors is an integer number (8727049908).

Almost surely, 2^63993939361 is an apocalyptic number.

It is an amenable number.

63993939361 is a deficient number, since it is larger than the sum of its proper divisors (5822459903).

63993939361 is a wasteful number, since it uses less digits than its factorization.

63993939361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402431.

The product of its digits is 19131876, while the sum is 61.

The spelling of 63993939361 in words is "sixty-three billion, nine hundred ninety-three million, nine hundred thirty-nine thousand, three hundred sixty-one".