64491542688 has 24 divisors (see below), whose sum is σ = 169290299808. Its totient is φ = 21497180864.

The previous prime is 64491542683. The next prime is 64491542723. The reversal of 64491542688 is 88624519446.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (64491542681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335893356 + ... + 335893547.

It is an arithmetic number, because the mean of its divisors is an integer number (7053762492).

Almost surely, 2^64491542688 is an apocalyptic number.

It is an amenable number.

64491542688 is an abundant number, since it is smaller than the sum of its proper divisors (104798757120).

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

64491542688 is a wasteful number, since it uses less digits than its factorization.

64491542688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671786916 (or 671786908 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 57.

The spelling of 64491542688 in words is "sixty-four billion, four hundred ninety-one million, five hundred forty-two thousand, six hundred eighty-eight".