164501868637 has 4 divisors (see below), whose sum is σ = 165957637500. Its totient is φ = 163046099776.

The previous prime is 164501868623. The next prime is 164501868647. The reversal of 164501868637 is 736868105461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85251736441 + 79250132196 = 291979^2 + 281514^2 .

It is a cyclic number.

It is not a de Polignac number, because 164501868637 - 2¹¹ = 164501866589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164501868607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 727884262 + ... + 727884487.

It is an arithmetic number, because the mean of its divisors is an integer number (41489409375).

Almost surely, 2^164501868637 is an apocalyptic number.

It is an amenable number.

164501868637 is a deficient number, since it is larger than the sum of its proper divisors (1455768863).

164501868637 is a wasteful number, since it uses less digits than its factorization.

164501868637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455768862.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 164501868637 in words is "one hundred sixty-four billion, five hundred one million, eight hundred sixty-eight thousand, six hundred thirty-seven".