161889429790 has 32 divisors (see below), whose sum is σ = 320212380384. Its totient is φ = 58439178240.

The previous prime is 161889429769. The next prime is 161889429797. The reversal of 161889429790 is 97924988161.

It is a happy number.

161889429790 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161889429797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5356179 + ... + 5386318.

It is an arithmetic number, because the mean of its divisors is an integer number (10006636887).

Almost surely, 2^161889429790 is an apocalyptic number.

161889429790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161889429790 is a deficient number, since it is larger than the sum of its proper divisors (158322950594).

161889429790 is a wasteful number, since it uses less digits than its factorization.

161889429790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10742652.

The product of its (nonzero) digits is 15676416, while the sum is 64.

The spelling of 161889429790 in words is "one hundred sixty-one billion, eight hundred eighty-nine million, four hundred twenty-nine thousand, seven hundred ninety".