663715005731666 has 16 divisors (see below), whose sum is σ = 1154779199739456. Its totient is φ = 280203776406576.

The previous prime is 663715005731641. The next prime is 663715005731669. The reversal of 663715005731666 is 666137500517366.

It is a junction number, because it is equal to n+sod(n) for n = 663715005731599 and 663715005731608.

It is not an unprimeable number, because it can be changed into a prime (663715005731669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353792646041 + ... + 353792647916.

It is an arithmetic number, because the mean of its divisors is an integer number (72173699983716).

Almost surely, 2^{663715005731666} is an apocalyptic number.

663715005731666 is a deficient number, since it is larger than the sum of its proper divisors (491064194007790).

663715005731666 is a wasteful number, since it uses less digits than its factorization.

663715005731666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707585294033.

The product of its (nonzero) digits is 85730400, while the sum is 62.

The spelling of 663715005731666 in words is "six hundred sixty-three trillion, seven hundred fifteen billion, five million, seven hundred thirty-one thousand, six hundred sixty-six".