161517885313 has 4 divisors (see below), whose sum is σ = 165274115248. Its totient is φ = 157761655380.

The previous prime is 161517885299. The next prime is 161517885341. The reversal of 161517885313 is 313588715161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161517885313 - 2³⁷ = 24078931841 is a prime.

It is a super-2 number, since 2×161517885313² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161517885413) 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, 1878114903 + ... + 1878114988.

It is an arithmetic number, because the mean of its divisors is an integer number (41318528812).

Almost surely, 2^161517885313 is an apocalyptic number.

It is an amenable number.

161517885313 is a deficient number, since it is larger than the sum of its proper divisors (3756229935).

161517885313 is an equidigital number, since it uses as much as digits as its factorization.

161517885313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3756229934.

The product of its digits is 604800, while the sum is 49.

The spelling of 161517885313 in words is "one hundred sixty-one billion, five hundred seventeen million, eight hundred eighty-five thousand, three hundred thirteen".