64847966920 has 64 divisors (see below), whose sum is σ = 159542058240. Its totient is φ = 23526297600.

The previous prime is 64847966917. The next prime is 64847966957. The reversal of 64847966920 is 2966974846.

It is a super-3 number, since 3×64847966920³ (a number of 33 digits) contains 333 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18664 + ... + 360616.

It is an arithmetic number, because the mean of its divisors is an integer number (2492844660).

Almost surely, 2^64847966920 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 64847966920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79771029120).

64847966920 is an abundant number, since it is smaller than the sum of its proper divisors (94694091320).

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

64847966920 is a wasteful number, since it uses less digits than its factorization.

64847966920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342406 (or 342402 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 61.

The spelling of 64847966920 in words is "sixty-four billion, eight hundred forty-seven million, nine hundred sixty-six thousand, nine hundred twenty".