181694228335547 has 2 divisors, whose sum is σ = 181694228335548. Its totient is φ = 181694228335546.

The previous prime is 181694228335469. The next prime is 181694228335549. The reversal of 181694228335547 is 745533822496181.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 181694228335547 - 2¹⁸ = 181694228073403 is a prime.

It is a super-2 number, since 2×181694228335547² (a number of 29 digits) contains 22 as substring.

Together with 181694228335549, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181694228335549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90847114167773 + 90847114167774.

It is an arithmetic number, because the mean of its divisors is an integer number (90847114167774).

Almost surely, 2^{181694228335547} is an apocalyptic number.

181694228335547 is a deficient number, since it is larger than the sum of its proper divisors (1).

181694228335547 is an equidigital number, since it uses as much as digits as its factorization.

181694228335547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 348364800, while the sum is 68.

The spelling of 181694228335547 in words is "one hundred eighty-one trillion, six hundred ninety-four billion, two hundred twenty-eight million, three hundred thirty-five thousand, five hundred forty-seven".