164036416165981 has 2 divisors, whose sum is σ = 164036416165982. Its totient is φ = 164036416165980.

The previous prime is 164036416165949. The next prime is 164036416166107. The reversal of 164036416165981 is 189561614630461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125138005980100 + 38898410185881 = 11186510^2 + 6236859^2 .

It is a cyclic number.

It is not a de Polignac number, because 164036416165981 - 2⁵ = 164036416165949 is a prime.

It is a super-2 number, since 2×164036416165981² (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 (164036416165081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82018208082990 + 82018208082991.

It is an arithmetic number, because the mean of its divisors is an integer number (82018208082991).

Almost surely, 2^{164036416165981} is an apocalyptic number.

It is an amenable number.

164036416165981 is a deficient number, since it is larger than the sum of its proper divisors (1).

164036416165981 is an equidigital number, since it uses as much as digits as its factorization.

164036416165981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22394880, while the sum is 61.

The spelling of 164036416165981 in words is "one hundred sixty-four trillion, thirty-six billion, four hundred sixteen million, one hundred sixty-five thousand, nine hundred eighty-one".