161855297792927 has 4 divisors (see below), whose sum is σ = 163287645561120. Its totient is φ = 160422950024736.

The previous prime is 161855297792887. The next prime is 161855297792933. The reversal of 161855297792927 is 729297792558161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161855297792927 - 2¹⁰ = 161855297791903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161855297792987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 716173883927 + ... + 716173884152.

It is an arithmetic number, because the mean of its divisors is an integer number (40821911390280).

Almost surely, 2^{161855297792927} is an apocalyptic number.

161855297792927 is a deficient number, since it is larger than the sum of its proper divisors (1432347768193).

161855297792927 is a wasteful number, since it uses less digits than its factorization.

161855297792927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432347768192.

The product of its digits is 2400451200, while the sum is 80.

The spelling of 161855297792927 in words is "one hundred sixty-one trillion, eight hundred fifty-five billion, two hundred ninety-seven million, seven hundred ninety-two thousand, nine hundred twenty-seven".