64648331544 has 64 divisors (see below), whose sum is σ = 171382940640. Its totient is φ = 20251607040.

The previous prime is 64648331521. The next prime is 64648331593. The reversal of 64648331544 is 44513384646.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 64648331493 and 64648331502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156864 + ... + 392304.

Almost surely, 2^64648331544 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 64648331544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85691470320).

64648331544 is an abundant number, since it is smaller than the sum of its proper divisors (106734609096).

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

64648331544 is a wasteful number, since it uses less digits than its factorization.

64648331544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236140 (or 236136 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 48.

The spelling of 64648331544 in words is "sixty-four billion, six hundred forty-eight million, three hundred thirty-one thousand, five hundred forty-four".