162561011112421 has 2 divisors, whose sum is σ = 162561011112422. Its totient is φ = 162561011112420.

The previous prime is 162561011112407. The next prime is 162561011112517. The reversal of 162561011112421 is 124211110165261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121209860916225 + 41351150196196 = 11009535^2 + 6430486^2 .

It is a cyclic number.

It is not a de Polignac number, because 162561011112421 - 2⁹ = 162561011111909 is a prime.

It is a super-5 number, since 5×162561011112421⁵ (a number of 72 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (162561011112221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81280505556210 + 81280505556211.

It is an arithmetic number, because the mean of its divisors is an integer number (81280505556211).

Almost surely, 2^{162561011112421} is an apocalyptic number.

It is an amenable number.

162561011112421 is a deficient number, since it is larger than the sum of its proper divisors (1).

162561011112421 is an equidigital number, since it uses as much as digits as its factorization.

162561011112421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 34.

Adding to 162561011112421 its reverse (124211110165261), we get a palindrome (286772121277682).

The spelling of 162561011112421 in words is "one hundred sixty-two trillion, five hundred sixty-one billion, eleven million, one hundred twelve thousand, four hundred twenty-one".