164961879581 has 2 divisors, whose sum is σ = 164961879582. Its totient is φ = 164961879580.

The previous prime is 164961879521. The next prime is 164961879671. The reversal of 164961879581 is 185978169461.

164961879581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92380131481 + 72581748100 = 303941^2 + 269410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164961879581 is a prime.

It is a super-2 number, since 2×164961879581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164961879521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82480939790 + 82480939791.

It is an arithmetic number, because the mean of its divisors is an integer number (82480939791).

Almost surely, 2^164961879581 is an apocalyptic number.

It is an amenable number.

164961879581 is a deficient number, since it is larger than the sum of its proper divisors (1).

164961879581 is an equidigital number, since it uses as much as digits as its factorization.

164961879581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 65.

The spelling of 164961879581 in words is "one hundred sixty-four billion, nine hundred sixty-one million, eight hundred seventy-nine thousand, five hundred eighty-one".