161502040241 has 4 divisors (see below), whose sum is σ = 161667345252. Its totient is φ = 161336735232.

The previous prime is 161502040229. The next prime is 161502040247. The reversal of 161502040241 is 142040205161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 142040205161 = 29 ⋅4897938109.

It can be written as a sum of positive squares in 2 ways, for example, as 137736734641 + 23765305600 = 371129^2 + 154160^2 .

It is a cyclic number.

It is not a de Polignac number, because 161502040241 - 2¹⁰ = 161502039217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161502040241.

It is not an unprimeable number, because it can be changed into a prime (161502040247) 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, 82651040 + ... + 82652993.

It is an arithmetic number, because the mean of its divisors is an integer number (40416836313).

Almost surely, 2^161502040241 is an apocalyptic number.

It is an amenable number.

161502040241 is a deficient number, since it is larger than the sum of its proper divisors (165305011).

161502040241 is an equidigital number, since it uses as much as digits as its factorization.

161502040241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165305010.

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 161502040241 in words is "one hundred sixty-one billion, five hundred two million, forty thousand, two hundred forty-one".