345399843176561 has 2 divisors, whose sum is σ = 345399843176562. Its totient is φ = 345399843176560.

The previous prime is 345399843176539. The next prime is 345399843176651. The reversal of 345399843176561 is 165671348993543.

Together with next prime (345399843176651) 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., 192147946721536 + 153251896455025 = 13861744^2 + 12379495^2 .

It is an emirp because it is prime and its reverse (165671348993543) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 345399843176561 - 2¹⁸ = 345399842914417 is a prime.

It is not a weakly prime, because it can be changed into another prime (345399843176501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172699921588280 + 172699921588281.

It is an arithmetic number, because the mean of its divisors is an integer number (172699921588281).

Almost surely, 2^{345399843176561} is an apocalyptic number.

It is an amenable number.

345399843176561 is a deficient number, since it is larger than the sum of its proper divisors (1).

345399843176561 is an equidigital number, since it uses as much as digits as its factorization.

345399843176561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1763596800, while the sum is 74.

The spelling of 345399843176561 in words is "three hundred forty-five trillion, three hundred ninety-nine billion, eight hundred forty-three million, one hundred seventy-six thousand, five hundred sixty-one".