542621564389 has 2 divisors, whose sum is σ = 542621564390. Its totient is φ = 542621564388.

The previous prime is 542621564339. The next prime is 542621564393. The reversal of 542621564389 is 983465126245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 438221492289 + 104400072100 = 661983^2 + 323110^2 .

It is a cyclic number.

It is not a de Polignac number, because 542621564389 - 2³⁵ = 508261826021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542621564339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271310782194 + 271310782195.

It is an arithmetic number, because the mean of its divisors is an integer number (271310782195).

Almost surely, 2^542621564389 is an apocalyptic number.

It is an amenable number.

542621564389 is a deficient number, since it is larger than the sum of its proper divisors (1).

542621564389 is an equidigital number, since it uses as much as digits as its factorization.

542621564389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12441600, while the sum is 55.

The spelling of 542621564389 in words is "five hundred forty-two billion, six hundred twenty-one million, five hundred sixty-four thousand, three hundred eighty-nine".