42684616987 has 2 divisors, whose sum is σ = 42684616988. Its totient is φ = 42684616986.

The previous prime is 42684616981. The next prime is 42684617047. The reversal of 42684616987 is 78961648624.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42684616987 is a prime.

It is a super-3 number, since 3×42684616987³ (a number of 33 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (42684616981) 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, 21342308493 + 21342308494.

It is an arithmetic number, because the mean of its divisors is an integer number (21342308494).

Almost surely, 2^42684616987 is an apocalyptic number.

42684616987 is a deficient number, since it is larger than the sum of its proper divisors (1).

42684616987 is an equidigital number, since it uses as much as digits as its factorization.

42684616987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27869184, while the sum is 61.

The spelling of 42684616987 in words is "forty-two billion, six hundred eighty-four million, six hundred sixteen thousand, nine hundred eighty-seven".