161840832544728 has 80 divisors (see below), whose sum is σ = 453352409279880. Its totient is φ = 53941204945152.

The previous prime is 161840832544669. The next prime is 161840832544799. The reversal of 161840832544728 is 827445238048161.

161840832544728 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 4 + 0 + 83 + 2 + 544 + 7 + 2 + 8 = 666.

161840832544728 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 an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7187425 + ... + 19373712.

Almost surely, 2^{161840832544728} is an apocalyptic number.

161840832544728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161840832544728 is an abundant number, since it is smaller than the sum of its proper divisors (291511576735152).

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

161840832544728 is a wasteful number, since it uses less digits than its factorization.

161840832544728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26570558 (or 26570545 counting only the distinct ones).

The product of its (nonzero) digits is 82575360, while the sum is 63.

The spelling of 161840832544728 in words is "one hundred sixty-one trillion, eight hundred forty billion, eight hundred thirty-two million, five hundred forty-four thousand, seven hundred twenty-eight".