161603281928 has 32 divisors (see below), whose sum is σ = 330590747520. Its totient is φ = 73447464000.

The previous prime is 161603281867. The next prime is 161603281933. The reversal of 161603281928 is 829182306161.

It is a happy number.

It is a super-2 number, since 2×161603281928² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684113 + ... + 889503.

It is an arithmetic number, because the mean of its divisors is an integer number (10330960860).

Almost surely, 2^161603281928 is an apocalyptic number.

It is an amenable number.

161603281928 is an abundant number, since it is smaller than the sum of its proper divisors (168987465592).

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

161603281928 is a wasteful number, since it uses less digits than its factorization.

161603281928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214349 (or 214345 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 161603281928 in words is "one hundred sixty-one billion, six hundred three million, two hundred eighty-one thousand, nine hundred twenty-eight".