165161401 has 2 divisors, whose sum is σ = 165161402. Its totient is φ = 165161400.

The previous prime is 165161393. The next prime is 165161417. The reversal of 165161401 is 104161561.

165161401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162537001 + 2624400 = 12749^2 + 1620^2 .

It is a cyclic number.

It is not a de Polignac number, because 165161401 - 2³ = 165161393 is a prime.

It is not a weakly prime, because it can be changed into another prime (165161461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82580700 + 82580701.

It is an arithmetic number, because the mean of its divisors is an integer number (82580701).

Almost surely, 2^165161401 is an apocalyptic number.

It is an amenable number.

165161401 is a deficient number, since it is larger than the sum of its proper divisors (1).

165161401 is an equidigital number, since it uses as much as digits as its factorization.

165161401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 165161401 is about 12851.5135684479. The cubic root of 165161401 is about 548.6594360051.

The spelling of 165161401 in words is "one hundred sixty-five million, one hundred sixty-one thousand, four hundred one".