161605600156501 has 16 divisors (see below), whose sum is σ = 170268965481600. Its totient is φ = 153079690506688.

The previous prime is 161605600156433. The next prime is 161605600156519. The reversal of 161605600156501 is 105651006506161.

It is a cyclic number.

It is not a de Polignac number, because 161605600156501 - 2¹³ = 161605600148309 is a prime.

It is a super-2 number, since 2×161605600156501² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161605600156571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4908706 + ... + 18636163.

It is an arithmetic number, because the mean of its divisors is an integer number (10641810342600).

Almost surely, 2^{161605600156501} is an apocalyptic number.

It is an amenable number.

161605600156501 is a deficient number, since it is larger than the sum of its proper divisors (8663365325099).

161605600156501 is a wasteful number, since it uses less digits than its factorization.

161605600156501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23547788.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 161605600156501 in words is "one hundred sixty-one trillion, six hundred five billion, six hundred million, one hundred fifty-six thousand, five hundred one".