681691580003 has 36 divisors (see below), whose sum is σ = 813138995760. Its totient is φ = 559164272352.

The previous prime is 681691579997. The next prime is 681691580021. The reversal of 681691580003 is 300085196186.

It is not a de Polignac number, because 681691580003 - 2¹⁰ = 681691578979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 681691580003.

It is not an unprimeable number, because it can be changed into a prime (681691582003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1964528876 + ... + 1964529222.

Almost surely, 2^681691580003 is an apocalyptic number.

681691580003 is a deficient number, since it is larger than the sum of its proper divisors (131447415757).

681691580003 is an frugal number, since it uses more digits than its factorization.

681691580003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 681691580003 in words is "six hundred eighty-one billion, six hundred ninety-one million, five hundred eighty thousand, three".