64121668863 has 128 divisors (see below), whose sum is σ = 108380160000. Its totient is φ = 33592769280.

The previous prime is 64121668847. The next prime is 64121668867. The reversal of 64121668863 is 36886612146.

It is not a de Polignac number, because 64121668863 - 2⁴ = 64121668847 is a prime.

It is a super-2 number, since 2×64121668863² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64121668867) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 133865458 + ... + 133865936.

It is an arithmetic number, because the mean of its divisors is an integer number (846720000).

Almost surely, 2^64121668863 is an apocalyptic number.

64121668863 is a deficient number, since it is larger than the sum of its proper divisors (44258491137).

64121668863 is a wasteful number, since it uses less digits than its factorization.

64121668863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730 (or 716 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 51.

The spelling of 64121668863 in words is "sixty-four billion, one hundred twenty-one million, six hundred sixty-eight thousand, eight hundred sixty-three".