542443520161 has 4 divisors (see below), whose sum is σ = 546402962052. Its totient is φ = 538484078272.

The previous prime is 542443520153. The next prime is 542443520231. The reversal of 542443520161 is 161025344245.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 229326054400 + 313117465761 = 478880^2 + 559569^2 .

It is a cyclic number.

It is not a de Polignac number, because 542443520161 - 2³ = 542443520153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 542443520161.

It is not an unprimeable number, because it can be changed into a prime (542443520131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1979720740 + ... + 1979721013.

It is an arithmetic number, because the mean of its divisors is an integer number (136600740513).

Almost surely, 2^542443520161 is an apocalyptic number.

It is an amenable number.

542443520161 is a deficient number, since it is larger than the sum of its proper divisors (3959441891).

542443520161 is a wasteful number, since it uses less digits than its factorization.

542443520161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959441890.

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 542443520161 in words is "five hundred forty-two billion, four hundred forty-three million, five hundred twenty thousand, one hundred sixty-one".