542515152721 has 8 divisors (see below), whose sum is σ = 552769093800. Its totient is φ = 532261871232.

The previous prime is 542515152679. The next prime is 542515152757. The reversal of 542515152721 is 127251515245.

It can be written as a sum of positive squares in 4 ways, for example, as 215890329600 + 326624823121 = 464640^2 + 571511^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 542515152721 - 2⁹ = 542515152209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542515152821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1691205 + ... + 1986253.

It is an arithmetic number, because the mean of its divisors is an integer number (69096136725).

Almost surely, 2^542515152721 is an apocalyptic number.

It is an amenable number.

542515152721 is a deficient number, since it is larger than the sum of its proper divisors (10253941079).

542515152721 is a wasteful number, since it uses less digits than its factorization.

542515152721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329795.

The product of its digits is 140000, while the sum is 40.

Adding to 542515152721 its reverse (127251515245), we get a palindrome (669766667966).

The spelling of 542515152721 in words is "five hundred forty-two billion, five hundred fifteen million, one hundred fifty-two thousand, seven hundred twenty-one".