63660161 has 4 divisors (see below), whose sum is σ = 64532292. Its totient is φ = 62788032.

The previous prime is 63660151. The next prime is 63660169. The reversal of 63660161 is 16106636.

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 38056561 + 25603600 = 6169^2 + 5060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63660161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63660169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435956 + ... + 436101.

It is an arithmetic number, because the mean of its divisors is an integer number (16133073).

Almost surely, 2^63660161 is an apocalyptic number.

It is an amenable number.

63660161 is a deficient number, since it is larger than the sum of its proper divisors (872131).

63660161 is an equidigital number, since it uses as much as digits as its factorization.

63660161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872130.

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

The square root of 63660161 is about 7978.7317914566. The cubic root of 63660161 is about 399.2907452208.

Adding to 63660161 its reverse (16106636), we get a palindrome (79766797).

The spelling of 63660161 in words is "sixty-three million, six hundred sixty thousand, one hundred sixty-one".