161841717661487 has 16 divisors (see below), whose sum is σ = 173437956633312. Its totient is φ = 150476404869120.

The previous prime is 161841717661427. The next prime is 161841717661531. The reversal of 161841717661487 is 784166717148161.

It is a cyclic number.

It is not a de Polignac number, because 161841717661487 - 2²⁰ = 161841716612911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161841717661427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17443223 + ... + 25058919.

It is an arithmetic number, because the mean of its divisors is an integer number (10839872289582).

Almost surely, 2^{161841717661487} is an apocalyptic number.

161841717661487 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

161841717661487 is a deficient number, since it is larger than the sum of its proper divisors (11596238971825).

161841717661487 is a wasteful number, since it uses less digits than its factorization.

161841717661487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7630858.

The product of its digits is 75866112, while the sum is 68.

The spelling of 161841717661487 in words is "one hundred sixty-one trillion, eight hundred forty-one billion, seven hundred seventeen million, six hundred sixty-one thousand, four hundred eighty-seven".