663788276127784 has 16 divisors (see below), whose sum is σ = 1244605570000020. Its totient is φ = 331893457461120.

The previous prime is 663788276127709. The next prime is 663788276127871. The reversal of 663788276127784 is 487721672887366.

It can be written as a sum of positive squares in 2 ways, for example, as 416417977567684 + 247370298560100 = 20406322^2 + 15728010^2 .

It is a super-2 number, since 2×663788276127784² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 663788276127698 and 663788276127707.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80918397 + ... + 88743244.

Almost surely, 2^{663788276127784} is an apocalyptic number.

It is an amenable number.

663788276127784 is a deficient number, since it is larger than the sum of its proper divisors (580817293872236).

663788276127784 is a wasteful number, since it uses less digits than its factorization.

663788276127784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170150700 (or 170150696 counting only the distinct ones).

The product of its digits is 12745506816, while the sum is 82.

The spelling of 663788276127784 in words is "six hundred sixty-three trillion, seven hundred eighty-eight billion, two hundred seventy-six million, one hundred twenty-seven thousand, seven hundred eighty-four".