663687949786366 has 8 divisors (see below), whose sum is σ = 1027645857733824. Its totient is φ = 321139330541760.

The previous prime is 663687949786249. The next prime is 663687949786399.

It is a happy number.

663687949786366 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5352322175635 + ... + 5352322175758.

It is an arithmetic number, because the mean of its divisors is an integer number (128455732216728).

Almost surely, 2^{663687949786366} is an apocalyptic number.

663687949786366 is a deficient number, since it is larger than the sum of its proper divisors (363957907947458).

663687949786366 is a wasteful number, since it uses less digits than its factorization.

663687949786366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10704644351426.

The product of its digits is 426649337856, while the sum is 94.

The spelling of 663687949786366 in words is "six hundred sixty-three trillion, six hundred eighty-seven billion, nine hundred forty-nine million, seven hundred eighty-six thousand, three hundred sixty-six".