161109385827 has 32 divisors (see below), whose sum is σ = 239464034880. Its totient is φ = 95665328640.

The previous prime is 161109385799. The next prime is 161109385837. The reversal of 161109385827 is 728583901161.

It is not a de Polignac number, because 161109385827 - 2¹² = 161109381731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161109385827.

It is not an unprimeable number, because it can be changed into a prime (161109385837) 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 31 ways as a sum of consecutive naturals, for example, 1789413 + ... + 1877289.

It is an arithmetic number, because the mean of its divisors is an integer number (7483251090).

Almost surely, 2^161109385827 is an apocalyptic number.

161109385827 is a deficient number, since it is larger than the sum of its proper divisors (78354649053).

161109385827 is a wasteful number, since it uses less digits than its factorization.

161109385827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89543.

The product of its (nonzero) digits is 725760, while the sum is 51.

The spelling of 161109385827 in words is "one hundred sixty-one billion, one hundred nine million, three hundred eighty-five thousand, eight hundred twenty-seven".