161582370245 has 4 divisors (see below), whose sum is σ = 193898844300. Its totient is φ = 129265896192.

The previous prime is 161582370239. The next prime is 161582370289. The reversal of 161582370245 is 542073285161.

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 33720344161 + 127862026084 = 183631^2 + 357578^2 .

It is a cyclic number.

It is not a de Polignac number, because 161582370245 - 2²⁴ = 161565593029 is a prime.

It is a super-2 number, since 2×161582370245² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161582370196 and 161582370205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16158237020 + ... + 16158237029.

It is an arithmetic number, because the mean of its divisors is an integer number (48474711075).

Almost surely, 2^161582370245 is an apocalyptic number.

It is an amenable number.

161582370245 is a deficient number, since it is larger than the sum of its proper divisors (32316474055).

161582370245 is an equidigital number, since it uses as much as digits as its factorization.

161582370245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32316474054.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 161582370245 in words is "one hundred sixty-one billion, five hundred eighty-two million, three hundred seventy thousand, two hundred forty-five".