164973696397681 has 2 divisors, whose sum is σ = 164973696397682. Its totient is φ = 164973696397680.

The previous prime is 164973696397373. The next prime is 164973696397703. The reversal of 164973696397681 is 186793696379461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86073397880625 + 78900298517056 = 9277575^2 + 8882584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164973696397681 is a prime.

It is a super-2 number, since 2×164973696397681² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (164973696397981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82486848198840 + 82486848198841.

It is an arithmetic number, because the mean of its divisors is an integer number (82486848198841).

Almost surely, 2^{164973696397681} is an apocalyptic number.

It is an amenable number.

164973696397681 is a deficient number, since it is larger than the sum of its proper divisors (1).

164973696397681 is an equidigital number, since it uses as much as digits as its factorization.

164973696397681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13332791808, while the sum is 85.

The spelling of 164973696397681 in words is "one hundred sixty-four trillion, nine hundred seventy-three billion, six hundred ninety-six million, three hundred ninety-seven thousand, six hundred eighty-one".