63661061 has 8 divisors (see below), whose sum is σ = 65950200. Its totient is φ = 61378240.

The previous prime is 63661057. The next prime is 63661097. The reversal of 63661061 is 16016636.

It can be written as a sum of positive squares in 4 ways, for example, as 5428900 + 58232161 = 2330^2 + 7631^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 63661061 - 2² = 63661057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63661261) 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, 29735 + ... + 31803.

It is an arithmetic number, because the mean of its divisors is an integer number (8243775).

Almost surely, 2^63661061 is an apocalyptic number.

It is an amenable number.

63661061 is a deficient number, since it is larger than the sum of its proper divisors (2289139).

63661061 is a wasteful number, since it uses less digits than its factorization.

63661061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3159.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 63661061 is about 7978.7881911980. The cubic root of 63661061 is about 399.2926268789.

Adding to 63661061 its reverse (16016636), we get a palindrome (79677697).

The spelling of 63661061 in words is "sixty-three million, six hundred sixty-one thousand, sixty-one".