87798691559 has 2 divisors, whose sum is σ = 87798691560. Its totient is φ = 87798691558.

The previous prime is 87798691529. The next prime is 87798691601. The reversal of 87798691559 is 95519689778.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87798691559 - 2²⁴ = 87781914343 is a prime.

It is a super-2 number, since 2×87798691559² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87798691529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43899345779 + 43899345780.

It is an arithmetic number, because the mean of its divisors is an integer number (43899345780).

Almost surely, 2^87798691559 is an apocalyptic number.

87798691559 is a deficient number, since it is larger than the sum of its proper divisors (1).

87798691559 is an equidigital number, since it uses as much as digits as its factorization.

87798691559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 342921600, while the sum is 74.

The spelling of 87798691559 in words is "eighty-seven billion, seven hundred ninety-eight million, six hundred ninety-one thousand, five hundred fifty-nine".