161665261064033 has 8 divisors (see below), whose sum is σ = 166041544186752. Its totient is φ = 157289343822576.

The previous prime is 161665261063987. The next prime is 161665261064059. The reversal of 161665261064033 is 330460162566161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161665261064033 is a prime.

It is a super-2 number, since 2×161665261064033² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161665261064833) 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, 90574535 + ... + 92342172.

It is an arithmetic number, because the mean of its divisors is an integer number (20755193023344).

Almost surely, 2^{161665261064033} is an apocalyptic number.

It is an amenable number.

161665261064033 is a deficient number, since it is larger than the sum of its proper divisors (4376283122719).

161665261064033 is a wasteful number, since it uses less digits than its factorization.

161665261064033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182940631.

The product of its (nonzero) digits is 2799360, while the sum is 50.

The spelling of 161665261064033 in words is "one hundred sixty-one trillion, six hundred sixty-five billion, two hundred sixty-one million, sixty-four thousand, thirty-three".