64661362948 has 144 divisors (see below), whose sum is σ = 148347312624. Its totient is φ = 24417469440.

The previous prime is 64661362939. The next prime is 64661362981. The reversal of 64661362948 is 84926316646.

It can be written as a sum of positive squares in 8 ways, for example, as 4992552964 + 59668809984 = 70658^2 + 244272^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4990158 + ... + 5003098.

It is an arithmetic number, because the mean of its divisors is an integer number (1030189671).

Almost surely, 2^64661362948 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 64661362948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74173656312).

64661362948 is an abundant number, since it is smaller than the sum of its proper divisors (83685949676).

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

64661362948 is a wasteful number, since it uses less digits than its factorization.

64661362948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13062 (or 13053 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 55.

The spelling of 64661362948 in words is "sixty-four billion, six hundred sixty-one million, three hundred sixty-two thousand, nine hundred forty-eight".