63345681 has 27 divisors (see below), whose sum is σ = 106719561. Its totient is φ = 36102024.

The previous prime is 63345647. The next prime is 63345701. The reversal of 63345681 is 18654336.

The square root of 63345681 is 7959.

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

63345681 is a `hidden beast` number, since 63 + 34 + 568 + 1 = 666.

It is not a de Polignac number, because 63345681 - 2²⁵ = 29791249 is a prime.

It is a super-2 number, since 2×63345681² = 8025350602707522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63345631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 166950 + ... + 167328.

Almost surely, 2^63345681 is an apocalyptic number.

63345681 is the 7959-th square number.

63345681 is the 3980-th centered octagonal number.

It is an amenable number.

63345681 is a deficient number, since it is larger than the sum of its proper divisors (43373880).

63345681 is an equidigital number, since it uses as much as digits as its factorization.

63345681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 389 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The cubic root of 63345681 is about 398.6321633053.

Multiplying 63345681 by its sum of digits (36), we get a square (2280444516 = 47754²).

It can be divided in two parts, 63 and 345681, that added together give a square (345744 = 588²).

The spelling of 63345681 in words is "sixty-three million, three hundred forty-five thousand, six hundred eighty-one".