178795345681 has 2 divisors, whose sum is σ = 178795345682. Its totient is φ = 178795345680.

The previous prime is 178795345679. The next prime is 178795345699. The reversal of 178795345681 is 186543597871.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101500225281 + 77295120400 = 318591^2 + 278020^2 .

It is an emirp because it is prime and its reverse (186543597871) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 178795345681 - 2¹ = 178795345679 is a prime.

It is a super-2 number, since 2×178795345681² (a number of 23 digits) contains 22 as substring.

Together with 178795345679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (178795345181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 89397672840 + 89397672841.

It is an arithmetic number, because the mean of its divisors is an integer number (89397672841).

Almost surely, 2^178795345681 is an apocalyptic number.

It is an amenable number.

178795345681 is a deficient number, since it is larger than the sum of its proper divisors (1).

178795345681 is an equidigital number, since it uses as much as digits as its factorization.

178795345681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50803200, while the sum is 64.

The spelling of 178795345681 in words is "one hundred seventy-eight billion, seven hundred ninety-five million, three hundred forty-five thousand, six hundred eighty-one".