63009661 has 24 divisors (see below), whose sum is σ = 76483512. Its totient is φ = 51532800.

The previous prime is 63009649. The next prime is 63009671. The reversal of 63009661 is 16690036.

It can be written as a sum of positive squares in 4 ways, for example, as 2013561 + 60996100 = 1419^2 + 7810^2 .

It is not a de Polignac number, because 63009661 - 2⁵ = 63009629 is a prime.

It is a super-3 number, since 3×63009661³ (a number of 24 digits) contains 333 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 (63009641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64005 + ... + 64981.

It is an arithmetic number, because the mean of its divisors is an integer number (3186813).

Almost surely, 2^63009661 is an apocalyptic number.

It is an amenable number.

63009661 is a deficient number, since it is larger than the sum of its proper divisors (13473851).

63009661 is a wasteful number, since it uses less digits than its factorization.

63009661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053 (or 1042 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 63009661 is about 7937.8624956596. The cubic root of 63009661 is about 397.9260592589.

Adding to 63009661 its reverse (16690036), we get a palindrome (79699697).

The spelling of 63009661 in words is "sixty-three million, nine thousand, six hundred sixty-one".