161356513546 has 4 divisors (see below), whose sum is σ = 242034770322. Its totient is φ = 80678256772.

The previous prime is 161356513517. The next prime is 161356513559. The reversal of 161356513546 is 645315653161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 645315653161 = 2447 ⋅263717063.

It can be written as a sum of positive squares in only one way, i.e., 151601988321 + 9754525225 = 389361^2 + 98765^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161356513496 and 161356513505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40339128385 + ... + 40339128388.

Almost surely, 2^161356513546 is an apocalyptic number.

161356513546 is a deficient number, since it is larger than the sum of its proper divisors (80678256776).

161356513546 is an equidigital number, since it uses as much as digits as its factorization.

161356513546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80678256775.

The product of its digits is 972000, while the sum is 46.

The spelling of 161356513546 in words is "one hundred sixty-one billion, three hundred fifty-six million, five hundred thirteen thousand, five hundred forty-six".