161424721108 has 24 divisors (see below), whose sum is σ = 333263942144. Its totient is φ = 66950344800.

The previous prime is 161424721103. The next prime is 161424721123. The reversal of 161424721108 is 801127424161.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161424721103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92985723 + ... + 92987458.

Almost surely, 2^161424721108 is an apocalyptic number.

It is an amenable number.

161424721108 is an abundant number, since it is smaller than the sum of its proper divisors (171839221036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161424721108 is a wasteful number, since it uses less digits than its factorization.

161424721108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185973223 (or 185973221 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The spelling of 161424721108 in words is "one hundred sixty-one billion, four hundred twenty-four million, seven hundred twenty-one thousand, one hundred eight".