63666512 has 80 divisors (see below), whose sum is σ = 154156800. Its totient is φ = 24800256.

The previous prime is 63666509. The next prime is 63666517. The reversal of 63666512 is 21566636.

It is a super-2 number, since 2×63666512² = 8106849500492288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63666517) 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, 105989 + ... + 106587.

It is an arithmetic number, because the mean of its divisors is an integer number (1926960).

Almost surely, 2^63666512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63666512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77078400).

63666512 is an abundant number, since it is smaller than the sum of its proper divisors (90490288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63666512 is a wasteful number, since it uses less digits than its factorization.

63666512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700 (or 694 counting only the distinct ones).

The product of its digits is 38880, while the sum is 35.

The square root of 63666512 is about 7979.1297771123. The cubic root of 63666512 is about 399.3040230760.

The spelling of 63666512 in words is "sixty-three million, six hundred sixty-six thousand, five hundred twelve".