161129506728 has 16 divisors (see below), whose sum is σ = 402823766880. Its totient is φ = 53709835568.

The previous prime is 161129506697. The next prime is 161129506771. The reversal of 161129506728 is 827605921161.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3356864700 + ... + 3356864747.

It is an arithmetic number, because the mean of its divisors is an integer number (25176485430).

Almost surely, 2^161129506728 is an apocalyptic number.

It is an amenable number.

161129506728 is an abundant number, since it is smaller than the sum of its proper divisors (241694260152).

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

161129506728 is a wasteful number, since it uses less digits than its factorization.

161129506728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6713729456 (or 6713729452 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 161129506728 in words is "one hundred sixty-one billion, one hundred twenty-nine million, five hundred six thousand, seven hundred twenty-eight".