681732600203 has 4 divisors (see below), whose sum is σ = 721834517880. Its totient is φ = 641630682528.

The previous prime is 681732600191. The next prime is 681732600217. The reversal of 681732600203 is 302006237186.

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 681732600203 - 2²⁴ = 681715822987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681732600233) 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, 20050958813 + ... + 20050958846.

It is an arithmetic number, because the mean of its divisors is an integer number (180458629470).

Almost surely, 2^681732600203 is an apocalyptic number.

681732600203 is a deficient number, since it is larger than the sum of its proper divisors (40101917677).

681732600203 is a wasteful number, since it uses less digits than its factorization.

681732600203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40101917676.

The product of its (nonzero) digits is 72576, while the sum is 38.

Adding to 681732600203 its sum of digits (38), we get a square (681732600241 = 825671²).

Adding to 681732600203 its reverse (302006237186), we get a palindrome (983738837389).

The spelling of 681732600203 in words is "six hundred eighty-one billion, seven hundred thirty-two million, six hundred thousand, two hundred three".