63345581 has 8 divisors (see below), whose sum is σ = 68338200. Its totient is φ = 58370112.

The previous prime is 63345577. The next prime is 63345589. The reversal of 63345581 is 18554336.

It can be written as a sum of positive squares in 4 ways, for example, as 1974025 + 61371556 = 1405^2 + 7834^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63345581 - 2² = 63345577 is a prime.

It is a super-3 number, since 3×63345581³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63345589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3995 + ... + 11943.

It is an arithmetic number, because the mean of its divisors is an integer number (8542275).

Almost surely, 2^63345581 is an apocalyptic number.

It is an amenable number.

63345581 is a deficient number, since it is larger than the sum of its proper divisors (4992619).

63345581 is a wasteful number, since it uses less digits than its factorization.

63345581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8575.

The product of its digits is 43200, while the sum is 35.

The square root of 63345581 is about 7958.9937178013. The cubic root of 63345581 is about 398.6319535396.

The spelling of 63345581 in words is "sixty-three million, three hundred forty-five thousand, five hundred eighty-one".