63639400666 has 8 divisors (see below), whose sum is σ = 97679080224. Its totient is φ = 31079707260.

The previous prime is 63639400633. The next prime is 63639400723. The reversal of 63639400666 is 66600493636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369996430 + ... + 369996601.

It is an arithmetic number, because the mean of its divisors is an integer number (12209885028).

Almost surely, 2^63639400666 is an apocalyptic number.

63639400666 is a deficient number, since it is larger than the sum of its proper divisors (34039679558).

63639400666 is a wasteful number, since it uses less digits than its factorization.

63639400666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739993076.

The product of its (nonzero) digits is 2519424, while the sum is 49.

The spelling of 63639400666 in words is "sixty-three billion, six hundred thirty-nine million, four hundred thousand, six hundred sixty-six".