161161591669 has 8 divisors (see below), whose sum is σ = 173565919800. Its totient is φ = 148758303936.

The previous prime is 161161591649. The next prime is 161161591709. The reversal of 161161591669 is 966195161161.

It can be written as a sum of positive squares in 4 ways, for example, as 797384644 + 160364207025 = 28238^2 + 400455^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 161161591669 - 2²⁵ = 161128037237 is a prime.

It is a super-2 number, since 2×161161591669² (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 (161161591649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77907 + ... + 573055.

It is an arithmetic number, because the mean of its divisors is an integer number (21695739975).

Almost surely, 2^161161591669 is an apocalyptic number.

It is an amenable number.

161161591669 is a deficient number, since it is larger than the sum of its proper divisors (12404328131).

161161591669 is a wasteful number, since it uses less digits than its factorization.

161161591669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520199.

The product of its digits is 524880, while the sum is 52.

The spelling of 161161591669 in words is "one hundred sixty-one billion, one hundred sixty-one million, five hundred ninety-one thousand, six hundred sixty-nine".