64351320516 has 144 divisors (see below), whose sum is σ = 187598436480. Its totient is φ = 18218995200.

The previous prime is 64351320511. The next prime is 64351320529. The reversal of 64351320516 is 61502315346.

64351320516 is a `hidden beast` number, since 6 + 4 + 3 + 5 + 132 + 0 + 516 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (64351320511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24199995 + ... + 24202653.

It is an arithmetic number, because the mean of its divisors is an integer number (1302766920).

Almost surely, 2^64351320516 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 64351320516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93799218240).

64351320516 is an abundant number, since it is smaller than the sum of its proper divisors (123247115964).

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

64351320516 is a wasteful number, since it uses less digits than its factorization.

64351320516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3514 (or 3509 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 64351320516 in words is "sixty-four billion, three hundred fifty-one million, three hundred twenty thousand, five hundred sixteen".