63961633 has 4 divisors (see below), whose sum is σ = 67724100. Its totient is φ = 60199168.

The previous prime is 63961631. The next prime is 63961663. The reversal of 63961633 is 33616936.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41370624 + 22591009 = 6432^2 + 4753^2 .

It is a cyclic number.

It is not a de Polignac number, because 63961633 - 2¹ = 63961631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63961592 and 63961601.

It is not an unprimeable number, because it can be changed into a prime (63961631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1881208 + ... + 1881241.

It is an arithmetic number, because the mean of its divisors is an integer number (16931025).

Almost surely, 2^63961633 is an apocalyptic number.

It is an amenable number.

63961633 is a deficient number, since it is larger than the sum of its proper divisors (3762467).

63961633 is a wasteful number, since it uses less digits than its factorization.

63961633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3762466.

The product of its digits is 52488, while the sum is 37.

The square root of 63961633 is about 7997.6017030107. The cubic root of 63961633 is about 399.9200527722.

The spelling of 63961633 in words is "sixty-three million, nine hundred sixty-one thousand, six hundred thirty-three".