5255921664 has 408 divisors, whose sum is σ = 18538682240. Its totient is φ = 1401421824.

The previous prime is 5255921647. The next prime is 5255921681. The reversal of 5255921664 is 4661295525.

5255921664 is a `hidden beast` number, since 52 + 5 + 592 + 1 + 6 + 6 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (5255921647) and next prime (5255921681).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78446559 + ... + 78446625.

Almost surely, 2^5255921664 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 5255921664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9269341120).

5255921664 is an abundant number, since it is smaller than the sum of its proper divisors (13282760576).

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

5255921664 is an equidigital number, since it uses as much as digits as its factorization.

5255921664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 98 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The square root of 5255921664 is about 72497.7355784303. The cubic root of 5255921664 is about 1738.6665328432. Note that the first 3 decimals are identical.

The spelling of 5255921664 in words is "five billion, two hundred fifty-five million, nine hundred twenty-one thousand, six hundred sixty-four".