63947661 has 8 divisors (see below), whose sum is σ = 85588800. Its totient is φ = 42469152.

The previous prime is 63947633. The next prime is 63947669. The reversal of 63947661 is 16674936.

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

It is not a de Polignac number, because 63947661 - 2¹⁰ = 63946637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63947669) 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, 39736 + ... + 41313.

It is an arithmetic number, because the mean of its divisors is an integer number (10698600).

Almost surely, 2^63947661 is an apocalyptic number.

It is an amenable number.

63947661 is a deficient number, since it is larger than the sum of its proper divisors (21641139).

63947661 is a wasteful number, since it uses less digits than its factorization.

63947661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81315.

The product of its digits is 163296, while the sum is 42.

The square root of 63947661 is about 7996.7281434347. The cubic root of 63947661 is about 399.8909306791.

The spelling of 63947661 in words is "sixty-three million, nine hundred forty-seven thousand, six hundred sixty-one".