75643459987 has 2 divisors, whose sum is σ = 75643459988. Its totient is φ = 75643459986.

The previous prime is 75643459963. The next prime is 75643460059. The reversal of 75643459987 is 78995434657.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75643459987 is a prime.

It is not a weakly prime, because it can be changed into another prime (75643459907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37821729993 + 37821729994.

It is an arithmetic number, because the mean of its divisors is an integer number (37821729994).

Almost surely, 2^75643459987 is an apocalyptic number.

75643459987 is a deficient number, since it is larger than the sum of its proper divisors (1).

75643459987 is an equidigital number, since it uses as much as digits as its factorization.

75643459987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 228614400, while the sum is 67.

The spelling of 75643459987 in words is "seventy-five billion, six hundred forty-three million, four hundred fifty-nine thousand, nine hundred eighty-seven".