1423565021161 has 2 divisors, whose sum is σ = 1423565021162. Its totient is φ = 1423565021160.

The previous prime is 1423565021159. The next prime is 1423565021189. The reversal of 1423565021161 is 1611205653241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 777140981136 + 646424040025 = 881556^2 + 804005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1423565021161 - 2¹ = 1423565021159 is a prime.

Together with 1423565021159, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1423565021161.

It is not a weakly prime, because it can be changed into another prime (1423565001161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 711782510580 + 711782510581.

It is an arithmetic number, because the mean of its divisors is an integer number (711782510581).

Almost surely, 2^{1423565021161} is an apocalyptic number.

It is an amenable number.

1423565021161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1423565021161 is an equidigital number, since it uses as much as digits as its factorization.

1423565021161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 1423565021161 in words is "one trillion, four hundred twenty-three billion, five hundred sixty-five million, twenty-one thousand, one hundred sixty-one".