165955121 has 8 divisors (see below), whose sum is σ = 171519744. Its totient is φ = 160403760.

The previous prime is 165955093. The next prime is 165955151. The reversal of 165955121 is 121559561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165955121 - 2⁶ = 165955057 is a prime.

It is a super-2 number, since 2×165955121² = 55082204372249282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165955151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26531 + ... + 32183.

It is an arithmetic number, because the mean of its divisors is an integer number (21439968).

Almost surely, 2^165955121 is an apocalyptic number.

It is an amenable number.

165955121 is a deficient number, since it is larger than the sum of its proper divisors (5564623).

165955121 is an equidigital number, since it uses as much as digits as its factorization.

165955121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6631.

The product of its digits is 13500, while the sum is 35.

The square root of 165955121 is about 12882.3569660214. The cubic root of 165955121 is about 549.5369336519.

The spelling of 165955121 in words is "one hundred sixty-five million, nine hundred fifty-five thousand, one hundred twenty-one".