64121205984 has 96 divisors (see below), whose sum is σ = 183672437760. Its totient is φ = 19425100800.

The previous prime is 64121205917. The next prime is 64121206027. The reversal of 64121205984 is 48950212146.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×64121205984² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5095252 + ... + 5107820.

It is an arithmetic number, because the mean of its divisors is an integer number (1913254560).

Almost surely, 2^64121205984 is an apocalyptic number.

It is an amenable number.

64121205984 is an abundant number, since it is smaller than the sum of its proper divisors (119551231776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64121205984 is a wasteful number, since it uses less digits than its factorization.

64121205984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17424 (or 17416 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 64121205984 in words is "sixty-four billion, one hundred twenty-one million, two hundred five thousand, nine hundred eighty-four".