181968651353 has 2 divisors, whose sum is σ = 181968651354. Its totient is φ = 181968651352.

The previous prime is 181968651317. The next prime is 181968651373. The reversal of 181968651353 is 353156869181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181819518409 + 149132944 = 426403^2 + 12212^2 .

It is a cyclic number.

It is not a de Polignac number, because 181968651353 - 2¹⁰ = 181968650329 is a prime.

It is a super-2 number, since 2×181968651353² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (181968651373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90984325676 + 90984325677.

It is an arithmetic number, because the mean of its divisors is an integer number (90984325677).

Almost surely, 2^181968651353 is an apocalyptic number.

It is an amenable number.

181968651353 is a deficient number, since it is larger than the sum of its proper divisors (1).

181968651353 is an equidigital number, since it uses as much as digits as its factorization.

181968651353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 56.

The spelling of 181968651353 in words is "one hundred eighty-one billion, nine hundred sixty-eight million, six hundred fifty-one thousand, three hundred fifty-three".