42165554369 has 2 divisors, whose sum is σ = 42165554370. Its totient is φ = 42165554368.

The previous prime is 42165554351. The next prime is 42165554413. The reversal of 42165554369 is 96345556124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40526923969 + 1638630400 = 201313^2 + 40480^2 .

It is a cyclic number.

It is not a de Polignac number, because 42165554369 - 2²⁰ = 42164505793 is a prime.

It is a super-2 number, since 2×42165554369² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42165554329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21082777184 + 21082777185.

It is an arithmetic number, because the mean of its divisors is an integer number (21082777185).

Almost surely, 2^42165554369 is an apocalyptic number.

It is an amenable number.

42165554369 is a deficient number, since it is larger than the sum of its proper divisors (1).

42165554369 is an equidigital number, since it uses as much as digits as its factorization.

42165554369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888000, while the sum is 50.

The spelling of 42165554369 in words is "forty-two billion, one hundred sixty-five million, five hundred fifty-four thousand, three hundred sixty-nine".