542220512681 has 2 divisors, whose sum is σ = 542220512682. Its totient is φ = 542220512680.

The previous prime is 542220512579. The next prime is 542220512707. The reversal of 542220512681 is 186215022245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 342858262681 + 199362250000 = 585541^2 + 446500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542220512681 is a prime.

It is a super-2 number, since 2×542220512681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (542220572681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271110256340 + 271110256341.

It is an arithmetic number, because the mean of its divisors is an integer number (271110256341).

Almost surely, 2^542220512681 is an apocalyptic number.

It is an amenable number.

542220512681 is a deficient number, since it is larger than the sum of its proper divisors (1).

542220512681 is an equidigital number, since it uses as much as digits as its factorization.

542220512681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76800, while the sum is 38.

The spelling of 542220512681 in words is "five hundred forty-two billion, two hundred twenty million, five hundred twelve thousand, six hundred eighty-one".