165156001 has 4 divisors (see below), whose sum is σ = 166169392. Its totient is φ = 164142612.

The previous prime is 165155959. The next prime is 165156053. The reversal of 165156001 is 100651561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165156001 - 2⁷ = 165155873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165106001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506451 + ... + 506776.

It is an arithmetic number, because the mean of its divisors is an integer number (41542348).

Almost surely, 2^165156001 is an apocalyptic number.

It is an amenable number.

165156001 is a deficient number, since it is larger than the sum of its proper divisors (1013391).

165156001 is a wasteful number, since it uses less digits than its factorization.

165156001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013390.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 165156001 is about 12851.3034747453. The cubic root of 165156001 is about 548.6534564134.

The spelling of 165156001 in words is "one hundred sixty-five million, one hundred fifty-six thousand, one".