161345231613 has 8 divisors (see below), whose sum is σ = 239029972800. Its totient is φ = 107563487724.

The previous prime is 161345231581. The next prime is 161345231623. The reversal of 161345231613 is 316132543161.

161345231613 is a `hidden beast` number, since 1 + 6 + 1 + 3 + 4 + 5 + 2 + 31 + 613 = 666.

It is not a de Polignac number, because 161345231613 - 2⁵ = 161345231581 is a prime.

It is a super-2 number, since 2×161345231613² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161345231623) 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, 2987874633 + ... + 2987874686.

It is an arithmetic number, because the mean of its divisors is an integer number (29878746600).

Almost surely, 2^161345231613 is an apocalyptic number.

It is an amenable number.

161345231613 is a deficient number, since it is larger than the sum of its proper divisors (77684741187).

161345231613 is an equidigital number, since it uses as much as digits as its factorization.

161345231613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5975749328 (or 5975749322 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

Adding to 161345231613 its reverse (316132543161), we get a palindrome (477477774774).

The spelling of 161345231613 in words is "one hundred sixty-one billion, three hundred forty-five million, two hundred thirty-one thousand, six hundred thirteen".