20161689049375 has 40 divisors (see below), whose sum is σ = 26064422152560. Its totient is φ = 15572201568000.

The previous prime is 20161689049367. The next prime is 20161689049417. The reversal of 20161689049375 is 57394098616102.

It is not a de Polignac number, because 20161689049375 - 2³ = 20161689049367 is a prime.

It is a hoax number, since the sum of its digits (61) coincides with the sum of the digits of its distinct prime factors.

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 39 ways as a sum of consecutive naturals, for example, 466932787 + ... + 466975963.

It is an arithmetic number, because the mean of its divisors is an integer number (651610553814).

It is a 1-persistent number, because it is pandigital, but 2⋅20161689049375 = 40323378098750 is not.

Almost surely, 2^{20161689049375} is an apocalyptic number.

20161689049375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20161689049375 is a deficient number, since it is larger than the sum of its proper divisors (5902733103185).

20161689049375 is an equidigital number, since it uses as much as digits as its factorization.

20161689049375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68989 (or 68974 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 20161689049375 in words is "twenty trillion, one hundred sixty-one billion, six hundred eighty-nine million, forty-nine thousand, three hundred seventy-five".