161513160769 has 3 divisors (see below), whose sum is σ = 161513562657. Its totient is φ = 161512758882.

The previous prime is 161513160709. The next prime is 161513160827. The reversal of 161513160769 is 967061315161.

The square root of 161513160769 is 401887.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 161513160769 - 2²³ = 161504772161 is a prime.

It is a super-2 number, since 2×161513160769² (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 (161513160709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 200944 + ... + 602830.

It is an arithmetic number, because the mean of its divisors is an integer number (53837854219).

Almost surely, 2^161513160769 is an apocalyptic number.

161513160769 is the 401887-th square number.

161513160769 is the 200944-th centered octagonal number.

It is an amenable number.

161513160769 is a deficient number, since it is larger than the sum of its proper divisors (401888).

161513160769 is an frugal number, since it uses more digits than its factorization.

161513160769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803774 (or 401887 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 46.

It can be divided in two parts, 1615 and 13160769, that added together give a square (13162384 = 3628²).

The spelling of 161513160769 in words is "one hundred sixty-one billion, five hundred thirteen million, one hundred sixty thousand, seven hundred sixty-nine".