167800644278441 has 2 divisors, whose sum is σ = 167800644278442. Its totient is φ = 167800644278440.

The previous prime is 167800644278369. The next prime is 167800644278471. The reversal of 167800644278441 is 144872446008761.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167418756121600 + 381888156841 = 12939040^2 + 617971^2 .

It is a cyclic number.

It is not a de Polignac number, because 167800644278441 - 2¹⁰ = 167800644277417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (167800644278471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83900322139220 + 83900322139221.

It is an arithmetic number, because the mean of its divisors is an integer number (83900322139221).

Almost surely, 2^{167800644278441} is an apocalyptic number.

It is an amenable number.

167800644278441 is a deficient number, since it is larger than the sum of its proper divisors (1).

167800644278441 is an equidigital number, since it uses as much as digits as its factorization.

167800644278441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57802752, while the sum is 62.

The spelling of 167800644278441 in words is "one hundred sixty-seven trillion, eight hundred billion, six hundred forty-four million, two hundred seventy-eight thousand, four hundred forty-one".