680138656903 has 4 divisors (see below), whose sum is σ = 680144892408. Its totient is φ = 680132421400.

The previous prime is 680138656877. The next prime is 680138656963. The reversal of 680138656903 is 309656831086.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 680138656903 - 2¹⁷ = 680138525831 is a prime.

It is a super-2 number, since 2×680138656903² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680138656963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2951173 + ... + 3173278.

It is an arithmetic number, because the mean of its divisors is an integer number (170036223102).

Almost surely, 2^680138656903 is an apocalyptic number.

680138656903 is a deficient number, since it is larger than the sum of its proper divisors (6235505).

680138656903 is a wasteful number, since it uses less digits than its factorization.

680138656903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6235504.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 680138656903 in words is "six hundred eighty billion, one hundred thirty-eight million, six hundred fifty-six thousand, nine hundred three".