161718407928 has 576 divisors, whose sum is σ = 578199837600. Its totient is φ = 41726361600.

The previous prime is 161718407881. The next prime is 161718407951. The reversal of 161718407928 is 829704817161.

161718407928 is a `hidden beast` number, since 1 + 617 + 18 + 4 + 0 + 7 + 9 + 2 + 8 = 666.

161718407928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 252290488 + ... + 252291128.

Almost surely, 2^161718407928 is an apocalyptic number.

161718407928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161718407928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289099918800).

161718407928 is an abundant number, since it is smaller than the sum of its proper divisors (416481429672).

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

161718407928 is a wasteful number, since it uses less digits than its factorization.

161718407928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889 (or 861 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 54.

The spelling of 161718407928 in words is "one hundred sixty-one billion, seven hundred eighteen million, four hundred seven thousand, nine hundred twenty-eight".