63630661 has 4 divisors (see below), whose sum is σ = 63647532. Its totient is φ = 63613792.

The previous prime is 63630659. The next prime is 63630667. The reversal of 63630661 is 16603636.

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 31708161 + 31922500 = 5631^2 + 5650^2 .

It is a cyclic number.

It is not a de Polignac number, because 63630661 - 2¹ = 63630659 is a prime.

It is a super-2 number, since 2×63630661² = 8097722038593842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63630667) 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, 105 + ... + 11281.

It is an arithmetic number, because the mean of its divisors is an integer number (15911883).

Almost surely, 2^63630661 is an apocalyptic number.

It is an amenable number.

63630661 is a deficient number, since it is larger than the sum of its proper divisors (16871).

63630661 is a wasteful number, since it uses less digits than its factorization.

63630661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16870.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 63630661 is about 7976.8829125166. The cubic root of 63630661 is about 399.2290588289.

The spelling of 63630661 in words is "sixty-three million, six hundred thirty thousand, six hundred sixty-one".