203403572681 has 2 divisors, whose sum is σ = 203403572682. Its totient is φ = 203403572680.

The previous prime is 203403572657. The next prime is 203403572717. The reversal of 203403572681 is 186275304302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141646849600 + 61756723081 = 376360^2 + 248509^2 .

It is a cyclic number.

It is not a de Polignac number, because 203403572681 - 2²⁶ = 203336463817 is a prime.

It is a super-2 number, since 2×203403572681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (203403572611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101701786340 + 101701786341.

It is an arithmetic number, because the mean of its divisors is an integer number (101701786341).

Almost surely, 2^203403572681 is an apocalyptic number.

It is an amenable number.

203403572681 is a deficient number, since it is larger than the sum of its proper divisors (1).

203403572681 is an equidigital number, since it uses as much as digits as its factorization.

203403572681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 41.

Adding to 203403572681 its reverse (186275304302), we get a palindrome (389678876983).

The spelling of 203403572681 in words is "two hundred three billion, four hundred three million, five hundred seventy-two thousand, six hundred eighty-one".