87998369513 has 2 divisors, whose sum is σ = 87998369514. Its totient is φ = 87998369512.

The previous prime is 87998369467. The next prime is 87998369521. The reversal of 87998369513 is 31596389978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72895680064 + 15102689449 = 269992^2 + 122893^2 .

It is a cyclic number.

It is not a de Polignac number, because 87998369513 - 2⁸ = 87998369257 is a prime.

It is not a weakly prime, because it can be changed into another prime (87998369813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43999184756 + 43999184757.

It is an arithmetic number, because the mean of its divisors is an integer number (43999184757).

Almost surely, 2^87998369513 is an apocalyptic number.

It is an amenable number.

87998369513 is a deficient number, since it is larger than the sum of its proper divisors (1).

87998369513 is an equidigital number, since it uses as much as digits as its factorization.

87998369513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88179840, while the sum is 68.

The spelling of 87998369513 in words is "eighty-seven billion, nine hundred ninety-eight million, three hundred sixty-nine thousand, five hundred thirteen".