161545978845 has 12 divisors (see below), whose sum is σ = 280013030076. Its totient is φ = 86157855360.

The previous prime is 161545978823. The next prime is 161545978903. The reversal of 161545978845 is 548879545161.

161545978845 is a `hidden beast` number, since 1 + 6 + 1 + 545 + 9 + 7 + 8 + 84 + 5 = 666.

161545978845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 18575781849 + 142970196996 = 136293^2 + 378114^2 .

It is not a de Polignac number, because 161545978845 - 2⁵ = 161545978813 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 1794955276 + ... + 1794955365.

It is an arithmetic number, because the mean of its divisors is an integer number (23334419173).

Almost surely, 2^161545978845 is an apocalyptic number.

161545978845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161545978845 is a deficient number, since it is larger than the sum of its proper divisors (118467051231).

161545978845 is a wasteful number, since it uses less digits than its factorization.

161545978845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3589910652 (or 3589910649 counting only the distinct ones).

The product of its digits is 48384000, while the sum is 63.

The spelling of 161545978845 in words is "one hundred sixty-one billion, five hundred forty-five million, nine hundred seventy-eight thousand, eight hundred forty-five".