42565121587 has 2 divisors, whose sum is σ = 42565121588. Its totient is φ = 42565121586.

The previous prime is 42565121563. The next prime is 42565121629. The reversal of 42565121587 is 78512156524.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42565121587 is a prime.

It is not a weakly prime, because it can be changed into another prime (42565121087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21282560793 + 21282560794.

It is an arithmetic number, because the mean of its divisors is an integer number (21282560794).

Almost surely, 2^42565121587 is an apocalyptic number.

42565121587 is a deficient number, since it is larger than the sum of its proper divisors (1).

42565121587 is an equidigital number, since it uses as much as digits as its factorization.

42565121587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672000, while the sum is 46.

The spelling of 42565121587 in words is "forty-two billion, five hundred sixty-five million, one hundred twenty-one thousand, five hundred eighty-seven".