164335910578549 has 2 divisors, whose sum is σ = 164335910578550. Its totient is φ = 164335910578548.

The previous prime is 164335910578517. The next prime is 164335910578571. The reversal of 164335910578549 is 945875019533461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151619376277924 + 12716534300625 = 12313382^2 + 3566025^2 .

It is a cyclic number.

It is not a de Polignac number, because 164335910578549 - 2⁵ = 164335910578517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164335910578649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82167955289274 + 82167955289275.

It is an arithmetic number, because the mean of its divisors is an integer number (82167955289275).

Almost surely, 2^{164335910578549} is an apocalyptic number.

It is an amenable number.

164335910578549 is a deficient number, since it is larger than the sum of its proper divisors (1).

164335910578549 is an equidigital number, since it uses as much as digits as its factorization.

164335910578549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888000, while the sum is 70.

The spelling of 164335910578549 in words is "one hundred sixty-four trillion, three hundred thirty-five billion, nine hundred ten million, five hundred seventy-eight thousand, five hundred forty-nine".