542603142661 has 4 divisors (see below), whose sum is σ = 542607741900. Its totient is φ = 542598543424.

The previous prime is 542603142649. The next prime is 542603142677. The reversal of 542603142661 is 166241306245.

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 384263612100 + 158339530561 = 619890^2 + 397919^2 .

It is a cyclic number.

It is not a de Polignac number, because 542603142661 - 2²¹ = 542601045509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542603142461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2117866 + ... + 2360203.

It is an arithmetic number, because the mean of its divisors is an integer number (135651935475).

Almost surely, 2^542603142661 is an apocalyptic number.

It is an amenable number.

542603142661 is a deficient number, since it is larger than the sum of its proper divisors (4599239).

542603142661 is a wasteful number, since it uses less digits than its factorization.

542603142661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4599238.

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 542603142661 in words is "five hundred forty-two billion, six hundred three million, one hundred forty-two thousand, six hundred sixty-one".