63844655625 has 75 divisors (see below), whose sum is σ = 119284170753. Its totient is φ = 34020162000.

The previous prime is 63844655617. The next prime is 63844655647. The reversal of 63844655625 is 52655644836.

The square root of 63844655625 is 252675.

It is a perfect power (a square), and thus also a powerful number.

63844655625 is a `hidden beast` number, since 6 + 3 + 8 + 4 + 4 + 6 + 5 + 5 + 625 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5005421001 + 58839234624 = 70749^2 + 242568^2 .

It is a tau number, because it is divible by the number of its divisors (75).

It is not a de Polignac number, because 63844655625 - 2³ = 63844655617 is a prime.

It is a super-2 number, since 2×63844655625² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 74 ways as a sum of consecutive naturals, for example, 56851314 + ... + 56852436.

Almost surely, 2^63844655625 is an apocalyptic number.

63844655625 is the 252675-th square number.

63844655625 is the 126338-th centered octagonal number.

It is an amenable number.

63844655625 is a deficient number, since it is larger than the sum of its proper divisors (55439515128).

63844655625 is an frugal number, since it uses more digits than its factorization.

63844655625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278 (or 1131 counting only the distinct ones).

The product of its digits is 20736000, while the sum is 54.

The spelling of 63844655625 in words is "sixty-three billion, eight hundred forty-four million, six hundred fifty-five thousand, six hundred twenty-five".