65605987 has 2 divisors, whose sum is σ = 65605988. Its totient is φ = 65605986.

The previous prime is 65605973. The next prime is 65605999. The reversal of 65605987 is 78950656.

65605987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65605987 is a prime.

It is not a weakly prime, because it can be changed into another prime (65605957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32802993 + 32802994.

It is an arithmetic number, because the mean of its divisors is an integer number (32802994).

Almost surely, 2^65605987 is an apocalyptic number.

65605987 is a deficient number, since it is larger than the sum of its proper divisors (1).

65605987 is an equidigital number, since it uses as much as digits as its factorization.

65605987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 65605987 is about 8099.7522801626. The cubic root of 65605987 is about 403.3182039419.

The spelling of 65605987 in words is "sixty-five million, six hundred five thousand, nine hundred eighty-seven".