63686641 has 6 divisors (see below), whose sum is σ = 67653590. Its totient is φ = 59940096.

The previous prime is 63686633. The next prime is 63686659. The reversal of 63686641 is 14668636.

It can be written as a sum of positive squares in 3 ways, for example, as 19184400 + 44502241 = 4380^2 + 6671^2 .

It is not a de Polignac number, because 63686641 - 2³ = 63686633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63686594 and 63686603.

It is not an unprimeable number, because it can be changed into a prime (63686621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109896 + ... + 110473.

Almost surely, 2^63686641 is an apocalyptic number.

It is an amenable number.

63686641 is a deficient number, since it is larger than the sum of its proper divisors (3966949).

63686641 is a wasteful number, since it uses less digits than its factorization.

63686641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220403 (or 220386 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The square root of 63686641 is about 7980.3910305197. The cubic root of 63686641 is about 399.3461003707.

The spelling of 63686641 in words is "sixty-three million, six hundred eighty-six thousand, six hundred forty-one".