164245020254981 has 2 divisors, whose sum is σ = 164245020254982. Its totient is φ = 164245020254980.

The previous prime is 164245020254963. The next prime is 164245020255047. The reversal of 164245020254981 is 189452020542461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163584483700225 + 660536554756 = 12790015^2 + 812734^2 .

It is a cyclic number.

It is not a de Polignac number, because 164245020254981 - 2²⁶ = 164244953146117 is a prime.

It is a super-2 number, since 2×164245020254981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164245020254941) 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, 82122510127490 + 82122510127491.

It is an arithmetic number, because the mean of its divisors is an integer number (82122510127491).

Almost surely, 2^{164245020254981} is an apocalyptic number.

It is an amenable number.

164245020254981 is a deficient number, since it is larger than the sum of its proper divisors (1).

164245020254981 is an equidigital number, since it uses as much as digits as its factorization.

164245020254981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5529600, while the sum is 53.

The spelling of 164245020254981 in words is "one hundred sixty-four trillion, two hundred forty-five billion, twenty million, two hundred fifty-four thousand, nine hundred eighty-one".