181664025274351 has 2 divisors, whose sum is σ = 181664025274352. Its totient is φ = 181664025274350.

The previous prime is 181664025274349. The next prime is 181664025274393. The reversal of 181664025274351 is 153472520466181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 181664025274351 - 2¹ = 181664025274349 is a prime.

Together with 181664025274349, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 181664025274292 and 181664025274301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181664025274751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90832012637175 + 90832012637176.

It is an arithmetic number, because the mean of its divisors is an integer number (90832012637176).

Almost surely, 2^{181664025274351} is an apocalyptic number.

181664025274351 is a deficient number, since it is larger than the sum of its proper divisors (1).

181664025274351 is an equidigital number, since it uses as much as digits as its factorization.

181664025274351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9676800, while the sum is 55.

The spelling of 181664025274351 in words is "one hundred eighty-one trillion, six hundred sixty-four billion, twenty-five million, two hundred seventy-four thousand, three hundred fifty-one".