165222454381 has 2 divisors, whose sum is σ = 165222454382. Its totient is φ = 165222454380.

The previous prime is 165222454373. The next prime is 165222454387. The reversal of 165222454381 is 183454222561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100993662025 + 64228792356 = 317795^2 + 253434^2 .

It is an emirp because it is prime and its reverse (183454222561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165222454381 - 2³ = 165222454373 is a prime.

It is a super-2 number, since 2×165222454381² (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 (165222454387) 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, 82611227190 + 82611227191.

It is an arithmetic number, because the mean of its divisors is an integer number (82611227191).

Almost surely, 2^165222454381 is an apocalyptic number.

It is an amenable number.

165222454381 is a deficient number, since it is larger than the sum of its proper divisors (1).

165222454381 is an equidigital number, since it uses as much as digits as its factorization.

165222454381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 460800, while the sum is 43.

The spelling of 165222454381 in words is "one hundred sixty-five billion, two hundred twenty-two million, four hundred fifty-four thousand, three hundred eighty-one".