542561021663 has 4 divisors (see below), whose sum is σ = 561270022440. Its totient is φ = 523852020888.

The previous prime is 542561021591. The next prime is 542561021767. The reversal of 542561021663 is 366120165245.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 542561021663 - 2¹⁴ = 542561005279 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 542561021663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542561041663) 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 in 3 ways as a sum of consecutive naturals, for example, 9354500345 + ... + 9354500402.

It is an arithmetic number, because the mean of its divisors is an integer number (140317505610).

Almost surely, 2^542561021663 is an apocalyptic number.

542561021663 is a deficient number, since it is larger than the sum of its proper divisors (18709000777).

542561021663 is a wasteful number, since it uses less digits than its factorization.

542561021663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18709000776.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 542561021663 in words is "five hundred forty-two billion, five hundred sixty-one million, twenty-one thousand, six hundred sixty-three".