63685221 has 8 divisors (see below), whose sum is σ = 85063104. Its totient is φ = 42382080.

The previous prime is 63685217. The next prime is 63685231. The reversal of 63685221 is 12258636.

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

It is not a de Polignac number, because 63685221 - 2² = 63685217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63685201) 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, 16665 + ... + 20126.

It is an arithmetic number, because the mean of its divisors is an integer number (10632888).

Almost surely, 2^63685221 is an apocalyptic number.

It is an amenable number.

63685221 is a deficient number, since it is larger than the sum of its proper divisors (21377883).

63685221 is a wasteful number, since it uses less digits than its factorization.

63685221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37371.

The product of its digits is 17280, while the sum is 33.

The square root of 63685221 is about 7980.3020619523. The cubic root of 63685221 is about 399.3431323193.

The spelling of 63685221 in words is "sixty-three million, six hundred eighty-five thousand, two hundred twenty-one".