181880680913 has 2 divisors, whose sum is σ = 181880680914. Its totient is φ = 181880680912.

The previous prime is 181880680897. The next prime is 181880680931. The reversal of 181880680913 is 319086088181.

Together with next prime (181880680931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181125145744 + 755535169 = 425588^2 + 27487^2 .

It is a cyclic number.

It is not a de Polignac number, because 181880680913 - 2⁴ = 181880680897 is a prime.

It is not a weakly prime, because it can be changed into another prime (181880680963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90940340456 + 90940340457.

It is an arithmetic number, because the mean of its divisors is an integer number (90940340457).

Almost surely, 2^181880680913 is an apocalyptic number.

It is an amenable number.

181880680913 is a deficient number, since it is larger than the sum of its proper divisors (1).

181880680913 is an equidigital number, since it uses as much as digits as its factorization.

181880680913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 663552, while the sum is 53.

The spelling of 181880680913 in words is "one hundred eighty-one billion, eight hundred eighty million, six hundred eighty thousand, nine hundred thirteen".