680663015554 has 16 divisors (see below), whose sum is σ = 1040963335992. Its totient is φ = 333729134208.

The previous prime is 680663015533. The next prime is 680663015563. The reversal of 680663015554 is 455510366086.

It can be written as a sum of positive squares in 4 ways, for example, as 680662950529 + 65025 = 825023^2 + 255^2 .

It is a junction number, because it is equal to n+sod(n) for n = 680663015498 and 680663015507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13448949 + ... + 13499464.

Almost surely, 2^680663015554 is an apocalyptic number.

680663015554 is a deficient number, since it is larger than the sum of its proper divisors (360300320438).

680663015554 is a wasteful number, since it uses less digits than its factorization.

680663015554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26948661.

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 680663015554 in words is "six hundred eighty billion, six hundred sixty-three million, fifteen thousand, five hundred fifty-four".