161165055001 has 8 divisors (see below), whose sum is σ = 171252636264. Its totient is φ = 151144949760.

The previous prime is 161165054957. The next prime is 161165055011. The reversal of 161165055001 is 100550561161.

It can be written as a sum of positive squares in 4 ways, for example, as 18659560000 + 142505495001 = 136600^2 + 377499^2 .

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 161165055001 - 2¹⁵ = 161165022233 is a prime.

It is a super-2 number, since 2×161165055001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161165055011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16864080 + ... + 16873633.

It is an arithmetic number, because the mean of its divisors is an integer number (21406579533).

Almost surely, 2^161165055001 is an apocalyptic number.

It is an amenable number.

161165055001 is a deficient number, since it is larger than the sum of its proper divisors (10087581263).

161165055001 is a wasteful number, since it uses less digits than its factorization.

161165055001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33738011.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 161165055001 in words is "one hundred sixty-one billion, one hundred sixty-five million, fifty-five thousand, one".