63991968003081 has 16 divisors (see below), whose sum is σ = 94928150617600. Its totient is φ = 42604956226224.

The previous prime is 63991968003079. The next prime is 63991968003151. The reversal of 63991968003081 is 18030086919936.

63991968003081 is a `hidden beast` number, since 6 + 399 + 1 + 96 + 80 + 0 + 3 + 0 + 81 = 666.

It is not a de Polignac number, because 63991968003081 - 2¹ = 63991968003079 is a prime.

It is a super-2 number, since 2×63991968003081² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63991968003001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1565417401 + ... + 1565458278.

It is an arithmetic number, because the mean of its divisors is an integer number (5933009413600).

Almost surely, 2^{63991968003081} is an apocalyptic number.

It is an amenable number.

63991968003081 is a deficient number, since it is larger than the sum of its proper divisors (30936182614519).

63991968003081 is a wasteful number, since it uses less digits than its factorization.

63991968003081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3130876445 (or 3130876439 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 63.

The spelling of 63991968003081 in words is "sixty-three trillion, nine hundred ninety-one billion, nine hundred sixty-eight million, three thousand, eighty-one".