164706317561 has 2 divisors, whose sum is σ = 164706317562. Its totient is φ = 164706317560.

The previous prime is 164706317533. The next prime is 164706317591. The reversal of 164706317561 is 165713607461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164592490000 + 113827561 = 405700^2 + 10669^2 .

It is an emirp because it is prime and its reverse (165713607461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164706317561 - 2¹⁸ = 164706055417 is a prime.

It is not a weakly prime, because it can be changed into another prime (164706317591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82353158780 + 82353158781.

It is an arithmetic number, because the mean of its divisors is an integer number (82353158781).

Almost surely, 2^164706317561 is an apocalyptic number.

It is an amenable number.

164706317561 is a deficient number, since it is larger than the sum of its proper divisors (1).

164706317561 is an equidigital number, since it uses as much as digits as its factorization.

164706317561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 164706317561 in words is "one hundred sixty-four billion, seven hundred six million, three hundred seventeen thousand, five hundred sixty-one".