165600161401 has 2 divisors, whose sum is σ = 165600161402. Its totient is φ = 165600161400.

The previous prime is 165600161393. The next prime is 165600161471. The reversal of 165600161401 is 104161006561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99540881001 + 66059280400 = 315501^2 + 257020^2 .

It is a cyclic number.

It is not a de Polignac number, because 165600161401 - 2³ = 165600161393 is a prime.

It is not a weakly prime, because it can be changed into another prime (165600161471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82800080700 + 82800080701.

It is an arithmetic number, because the mean of its divisors is an integer number (82800080701).

Almost surely, 2^165600161401 is an apocalyptic number.

It is an amenable number.

165600161401 is a deficient number, since it is larger than the sum of its proper divisors (1).

165600161401 is an equidigital number, since it uses as much as digits as its factorization.

165600161401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 165600161401 its reverse (104161006561), we get a palindrome (269761167962).

The spelling of 165600161401 in words is "one hundred sixty-five billion, six hundred million, one hundred sixty-one thousand, four hundred one".