542663181721 has 32 divisors (see below), whose sum is σ = 573424220160. Its totient is φ = 513051162624.

The previous prime is 542663181679. The next prime is 542663181751. The reversal of 542663181721 is 127181366245.

It is a cyclic number.

It is not a de Polignac number, because 542663181721 - 2¹⁷ = 542663050649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542663181751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73398601 + ... + 73405993.

It is an arithmetic number, because the mean of its divisors is an integer number (17919506880).

Almost surely, 2^542663181721 is an apocalyptic number.

It is an amenable number.

542663181721 is a deficient number, since it is larger than the sum of its proper divisors (30761038439).

542663181721 is a wasteful number, since it uses less digits than its factorization.

542663181721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7945.

The product of its digits is 483840, while the sum is 46.

The spelling of 542663181721 in words is "five hundred forty-two billion, six hundred sixty-three million, one hundred eighty-one thousand, seven hundred twenty-one".