165542245541 has 2 divisors, whose sum is σ = 165542245542. Its totient is φ = 165542245540.

The previous prime is 165542245537. The next prime is 165542245543. The reversal of 165542245541 is 145542245561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144194113441 + 21348132100 = 379729^2 + 146110^2 .

It is an emirp because it is prime and its reverse (145542245561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165542245541 - 2² = 165542245537 is a prime.

Together with 165542245543, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 165542245492 and 165542245501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165542245543) 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, 82771122770 + 82771122771.

It is an arithmetic number, because the mean of its divisors is an integer number (82771122771).

Almost surely, 2^165542245541 is an apocalyptic number.

It is an amenable number.

165542245541 is a deficient number, since it is larger than the sum of its proper divisors (1).

165542245541 is an equidigital number, since it uses as much as digits as its factorization.

165542245541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960000, while the sum is 44.

The spelling of 165542245541 in words is "one hundred sixty-five billion, five hundred forty-two million, two hundred forty-five thousand, five hundred forty-one".