63660121 has 16 divisors (see below), whose sum is σ = 77258880. Its totient is φ = 51206400.

The previous prime is 63660073. The next prime is 63660151. The reversal of 63660121 is 12106636.

63660121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 63660121 - 2¹⁵ = 63627353 is a prime.

It is a super-2 number, since 2×63660121² = 8105222011469282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63660151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60046 + ... + 61096.

It is an arithmetic number, because the mean of its divisors is an integer number (4828680).

Almost surely, 2^63660121 is an apocalyptic number.

It is an amenable number.

63660121 is a deficient number, since it is larger than the sum of its proper divisors (13598759).

63660121 is a wasteful number, since it uses less digits than its factorization.

63660121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 63660121 is about 7978.7292847922. The cubic root of 63660121 is about 399.2906615911.

Adding to 63660121 its reverse (12106636), we get a palindrome (75766757).

The spelling of 63660121 in words is "sixty-three million, six hundred sixty thousand, one hundred twenty-one".