162336782870021 has 2 divisors, whose sum is σ = 162336782870022. Its totient is φ = 162336782870020.

The previous prime is 162336782870011. The next prime is 162336782870023. The reversal of 162336782870021 is 120078287633261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147256064977921 + 15080717892100 = 12134911^2 + 3883390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-162336782870021 is a prime.

Together with 162336782870023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (162336782870023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81168391435010 + 81168391435011.

It is an arithmetic number, because the mean of its divisors is an integer number (81168391435011).

Almost surely, 2^{162336782870021} is an apocalyptic number.

It is an amenable number.

162336782870021 is a deficient number, since it is larger than the sum of its proper divisors (1).

162336782870021 is an equidigital number, since it uses as much as digits as its factorization.

162336782870021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8128512, while the sum is 56.

The spelling of 162336782870021 in words is "one hundred sixty-two trillion, three hundred thirty-six billion, seven hundred eighty-two million, eight hundred seventy thousand, twenty-one".