167805001561 has 2 divisors, whose sum is σ = 167805001562. Its totient is φ = 167805001560.

The previous prime is 167805001541. The next prime is 167805001579. The reversal of 167805001561 is 165100508761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165990241561 + 1814760000 = 407419^2 + 42600^2 .

It is a cyclic number.

It is not a de Polignac number, because 167805001561 - 2¹⁷ = 167804870489 is a prime.

It is not a weakly prime, because it can be changed into another prime (167805001501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83902500780 + 83902500781.

It is an arithmetic number, because the mean of its divisors is an integer number (83902500781).

Almost surely, 2^167805001561 is an apocalyptic number.

It is an amenable number.

167805001561 is a deficient number, since it is larger than the sum of its proper divisors (1).

167805001561 is an equidigital number, since it uses as much as digits as its factorization.

167805001561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 40.

The spelling of 167805001561 in words is "one hundred sixty-seven billion, eight hundred five million, one thousand, five hundred sixty-one".