167777611321 has 2 divisors, whose sum is σ = 167777611322. Its totient is φ = 167777611320.

The previous prime is 167777611303. The next prime is 167777611327. The reversal of 167777611321 is 123116777761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131272159225 + 36505452096 = 362315^2 + 191064^2 .

It is a cyclic number.

It is not a de Polignac number, because 167777611321 - 2¹¹ = 167777609273 is a prime.

It is not a weakly prime, because it can be changed into another prime (167777611327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83888805660 + 83888805661.

It is an arithmetic number, because the mean of its divisors is an integer number (83888805661).

Almost surely, 2^167777611321 is an apocalyptic number.

It is an amenable number.

167777611321 is a deficient number, since it is larger than the sum of its proper divisors (1).

167777611321 is an equidigital number, since it uses as much as digits as its factorization.

167777611321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518616, while the sum is 49.

The spelling of 167777611321 in words is "one hundred sixty-seven billion, seven hundred seventy-seven million, six hundred eleven thousand, three hundred twenty-one".