164621356541 has 4 divisors (see below), whose sum is σ = 165140667132. Its totient is φ = 164102045952.

The previous prime is 164621356513. The next prime is 164621356567. The reversal of 164621356541 is 145653126461.

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 88571712100 + 76049644441 = 297610^2 + 275771^2 .

It is a cyclic number.

It is not a de Polignac number, because 164621356541 - 2¹⁴ = 164621340157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164621356492 and 164621356501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164621356741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259654820 + ... + 259655453.

It is an arithmetic number, because the mean of its divisors is an integer number (41285166783).

Almost surely, 2^164621356541 is an apocalyptic number.

It is an amenable number.

164621356541 is a deficient number, since it is larger than the sum of its proper divisors (519310591).

164621356541 is an equidigital number, since it uses as much as digits as its factorization.

164621356541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519310590.

The product of its digits is 518400, while the sum is 44.

The spelling of 164621356541 in words is "one hundred sixty-four billion, six hundred twenty-one million, three hundred fifty-six thousand, five hundred forty-one".