87745289748509 has 2 divisors, whose sum is σ = 87745289748510. Its totient is φ = 87745289748508.

The previous prime is 87745289748451. The next prime is 87745289748511. The reversal of 87745289748509 is 90584798254778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45227104512100 + 42518185236409 = 6725110^2 + 6520597^2 .

It is a cyclic number.

It is not a de Polignac number, because 87745289748509 - 2³² = 87740994781213 is a prime.

Together with 87745289748511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87745289748569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43872644874254 + 43872644874255.

It is an arithmetic number, because the mean of its divisors is an integer number (43872644874255).

Almost surely, 2^{87745289748509} is an apocalyptic number.

It is an amenable number.

87745289748509 is a deficient number, since it is larger than the sum of its proper divisors (1).

87745289748509 is an equidigital number, since it uses as much as digits as its factorization.

87745289748509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11379916800, while the sum is 83.

The spelling of 87745289748509 in words is "eighty-seven trillion, seven hundred forty-five billion, two hundred eighty-nine million, seven hundred forty-eight thousand, five hundred nine".