64663805481 has 16 divisors (see below), whose sum is σ = 94091551680. Its totient is φ = 39175557120.

The previous prime is 64663805461. The next prime is 64663805483. The reversal of 64663805481 is 18450836646.

64663805481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64663805481 - 2⁵ = 64663805449 is a prime.

It is a super-2 number, since 2×64663805481² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64663805483) 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, 275620 + ... + 453093.

It is an arithmetic number, because the mean of its divisors is an integer number (5880721980).

Almost surely, 2^64663805481 is an apocalyptic number.

It is an amenable number.

64663805481 is a deficient number, since it is larger than the sum of its proper divisors (29427746199).

64663805481 is a wasteful number, since it uses less digits than its factorization.

64663805481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731416.

The product of its (nonzero) digits is 3317760, while the sum is 51.

The spelling of 64663805481 in words is "sixty-four billion, six hundred sixty-three million, eight hundred five thousand, four hundred eighty-one".