161023428012 has 24 divisors (see below), whose sum is σ = 384459038656. Its totient is φ = 52426232208.

The previous prime is 161023427953. The next prime is 161023428107. The reversal of 161023428012 is 210824320161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156029938 + ... + 156030969.

Almost surely, 2^161023428012 is an apocalyptic number.

161023428012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161023428012 is an abundant number, since it is smaller than the sum of its proper divisors (223435610644).

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

161023428012 is a wasteful number, since it uses less digits than its factorization.

161023428012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312060957 (or 312060955 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

Adding to 161023428012 its reverse (210824320161), we get a palindrome (371847748173).

The spelling of 161023428012 in words is "one hundred sixty-one billion, twenty-three million, four hundred twenty-eight thousand, twelve".