64991008572 has 192 divisors, whose sum is σ = 179767762944. Its totient is φ = 17890709760.

The previous prime is 64991008567. The next prime is 64991008583. The reversal of 64991008572 is 27580019946.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 98321922 + ... + 98322582.

It is an arithmetic number, because the mean of its divisors is an integer number (936290432).

Almost surely, 2^64991008572 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64991008572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89883881472).

64991008572 is an abundant number, since it is smaller than the sum of its proper divisors (114776754372).

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

64991008572 is a wasteful number, since it uses less digits than its factorization.

64991008572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048 (or 1046 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 64991008572 in words is "sixty-four billion, nine hundred ninety-one million, eight thousand, five hundred seventy-two".