165111401 has 16 divisors (see below), whose sum is σ = 204134784. Its totient is φ = 130045824.

The previous prime is 165111391. The next prime is 165111409. The reversal of 165111401 is 104111561.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165111401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165111409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16661 + ... + 24653.

It is an arithmetic number, because the mean of its divisors is an integer number (12758424).

Almost surely, 2^165111401 is an apocalyptic number.

It is an amenable number.

165111401 is a deficient number, since it is larger than the sum of its proper divisors (39023383).

165111401 is a wasteful number, since it uses less digits than its factorization.

165111401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8240.

The product of its (nonzero) digits is 120, while the sum is 20.

The square root of 165111401 is about 12849.5681250383. The cubic root of 165111401 is about 548.6040644304.

Adding to 165111401 its reverse (104111561), we get a palindrome (269222962).

The spelling of 165111401 in words is "one hundred sixty-five million, one hundred eleven thousand, four hundred one".