64648381250 has 24 divisors (see below), whose sum is σ = 121207968756. Its totient is φ = 25859350000.

The previous prime is 64648381249. The next prime is 64648381289. The reversal of 64648381250 is 5218384646.

It can be written as a sum of positive squares in 6 ways, for example, as 8017232521 + 56631148729 = 89539^2 + 237973^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64648381195 and 64648381204.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5165621 + ... + 5178120.

Almost surely, 2^64648381250 is an apocalyptic number.

64648381250 is a deficient number, since it is larger than the sum of its proper divisors (56559587506).

64648381250 is an equidigital number, since it uses as much as digits as its factorization.

64648381250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10343768 (or 10343748 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 47.

The spelling of 64648381250 in words is "sixty-four billion, six hundred forty-eight million, three hundred eighty-one thousand, two hundred fifty".