161606010565073 has 4 divisors (see below), whose sum is σ = 161617057541940. Its totient is φ = 161594963588208.

The previous prime is 161606010565019. The next prime is 161606010565079. The reversal of 161606010565073 is 370565010606161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75528753169984 + 86077257395089 = 8690728^2 + 9277783^2 .

It is a cyclic number.

It is not a de Polignac number, because 161606010565073 - 2⁶ = 161606010565009 is a prime.

It is a super-3 number, since 3×161606010565073³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161606010565079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5523466490 + ... + 5523495747.

It is an arithmetic number, because the mean of its divisors is an integer number (40404264385485).

Almost surely, 2^{161606010565073} is an apocalyptic number.

It is an amenable number.

161606010565073 is a deficient number, since it is larger than the sum of its proper divisors (11046976867).

161606010565073 is a wasteful number, since it uses less digits than its factorization.

161606010565073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11046976866.

The product of its (nonzero) digits is 680400, while the sum is 47.

The spelling of 161606010565073 in words is "one hundred sixty-one trillion, six hundred six billion, ten million, five hundred sixty-five thousand, seventy-three".