165555001 has 8 divisors (see below), whose sum is σ = 167443200. Its totient is φ = 163673328.

The previous prime is 165554981. The next prime is 165555011. The reversal of 165555001 is 100555561.

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 165555001 - 2⁹ = 165554489 is a prime.

It is a super-2 number, since 2×165555001² = 54816916712220002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165555011) 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, 63675 + ... + 66223.

It is an arithmetic number, because the mean of its divisors is an integer number (20930400).

Almost surely, 2^165555001 is an apocalyptic number.

It is an amenable number.

165555001 is a deficient number, since it is larger than the sum of its proper divisors (1888199).

165555001 is a wasteful number, since it uses less digits than its factorization.

165555001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3263.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 165555001 is about 12866.8178272641. The cubic root of 165555001 is about 549.0949312892.

The spelling of 165555001 in words is "one hundred sixty-five million, five hundred fifty-five thousand, one".