663981102478 has 16 divisors (see below), whose sum is σ = 1052430151680. Its totient is φ = 313536479256.

The previous prime is 663981102457. The next prime is 663981102479. The reversal of 663981102478 is 874201189366.

663981102478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663981102479) 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, 91353150 + ... + 91360417.

It is an arithmetic number, because the mean of its divisors is an integer number (65776884480).

Almost surely, 2^663981102478 is an apocalyptic number.

663981102478 is a deficient number, since it is larger than the sum of its proper divisors (388449049202).

663981102478 is a wasteful number, since it uses less digits than its factorization.

663981102478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182713671.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 663981102478 in words is "six hundred sixty-three billion, nine hundred eighty-one million, one hundred two thousand, four hundred seventy-eight".