63660081 has 16 divisors (see below), whose sum is σ = 89661440. Its totient is φ = 40113360.

The previous prime is 63660073. The next prime is 63660151. The reversal of 63660081 is 18006636.

It is not a de Polignac number, because 63660081 - 2³ = 63660073 is a prime.

It is a super-2 number, since 2×63660081² = 8105211825853122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63660031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3961 + ... + 11958.

It is an arithmetic number, because the mean of its divisors is an integer number (5603840).

Almost surely, 2^63660081 is an apocalyptic number.

It is an amenable number.

63660081 is a deficient number, since it is larger than the sum of its proper divisors (26001359).

63660081 is a wasteful number, since it uses less digits than its factorization.

63660081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15996.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 63660081 is about 7978.7267781269. The cubic root of 63660081 is about 399.2905779614.

The spelling of 63660081 in words is "sixty-three million, six hundred sixty thousand, eighty-one".