161172380311 has 2 divisors, whose sum is σ = 161172380312. Its totient is φ = 161172380310.

The previous prime is 161172380279. The next prime is 161172380339. The reversal of 161172380311 is 113083271161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161172380311 - 2⁵ = 161172380279 is a prime.

It is a super-2 number, since 2×161172380311² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161172380111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80586190155 + 80586190156.

It is an arithmetic number, because the mean of its divisors is an integer number (80586190156).

Almost surely, 2^161172380311 is an apocalyptic number.

161172380311 is a deficient number, since it is larger than the sum of its proper divisors (1).

161172380311 is an equidigital number, since it uses as much as digits as its factorization.

161172380311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The spelling of 161172380311 in words is "one hundred sixty-one billion, one hundred seventy-two million, three hundred eighty thousand, three hundred eleven".