63661647 has 16 divisors (see below), whose sum is σ = 102114560. Its totient is φ = 34463232.

The previous prime is 63661607. The next prime is 63661667. The reversal of 63661647 is 74616636.

It is a happy number.

It is not a de Polignac number, because 63661647 - 2¹² = 63657551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63661607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79378 + ... + 80175.

It is an arithmetic number, because the mean of its divisors is an integer number (6382160).

Almost surely, 2^63661647 is an apocalyptic number.

63661647 is a deficient number, since it is larger than the sum of its proper divisors (38452913).

63661647 is a wasteful number, since it uses less digits than its factorization.

63661647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159582.

The product of its digits is 108864, while the sum is 39.

The square root of 63661647 is about 7978.8249134819. The cubic root of 63661647 is about 399.2938520379.

The spelling of 63661647 in words is "sixty-three million, six hundred sixty-one thousand, six hundred forty-seven".