161308073405 has 8 divisors (see below), whose sum is σ = 193606512984. Its totient is φ = 129021908800.

The previous prime is 161308073401. The next prime is 161308073461. The reversal of 161308073405 is 504370803161.

It can be written as a sum of positive squares in 4 ways, for example, as 27060579001 + 134247494404 = 164501^2 + 366398^2 .

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

It is not a de Polignac number, because 161308073405 - 2² = 161308073401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161308073401) 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, 3039806 + ... + 3092415.

It is an arithmetic number, because the mean of its divisors is an integer number (24200814123).

Almost surely, 2^161308073405 is an apocalyptic number.

It is an amenable number.

161308073405 is a deficient number, since it is larger than the sum of its proper divisors (32298439579).

161308073405 is an equidigital number, since it uses as much as digits as its factorization.

161308073405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6137487.

The product of its (nonzero) digits is 60480, while the sum is 38.

Adding to 161308073405 its reverse (504370803161), we get a palindrome (665678876566).

The spelling of 161308073405 in words is "one hundred sixty-one billion, three hundred eight million, seventy-three thousand, four hundred five".