164191894503 has 32 divisors (see below), whose sum is σ = 270797184000. Its totient is φ = 86171475456.

The previous prime is 164191894487. The next prime is 164191894513. The reversal of 164191894503 is 305498191461.

It is a happy number.

It is not a de Polignac number, because 164191894503 - 2⁴ = 164191894487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164191894513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1456818 + ... + 1565471.

It is an arithmetic number, because the mean of its divisors is an integer number (8462412000).

Almost surely, 2^164191894503 is an apocalyptic number.

164191894503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

164191894503 is a deficient number, since it is larger than the sum of its proper divisors (106605289497).

164191894503 is a wasteful number, since it uses less digits than its factorization.

164191894503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022511.

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 164191894503 in words is "one hundred sixty-four billion, one hundred ninety-one million, eight hundred ninety-four thousand, five hundred three".