87790809713 has 2 divisors, whose sum is σ = 87790809714. Its totient is φ = 87790809712.

The previous prime is 87790809707. The next prime is 87790809737. The reversal of 87790809713 is 31790809778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66119436769 + 21671372944 = 257137^2 + 147212^2 .

It is a cyclic number.

It is not a de Polignac number, because 87790809713 - 2²² = 87786615409 is a prime.

It is not a weakly prime, because it can be changed into another prime (87790809763) 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, 43895404856 + 43895404857.

It is an arithmetic number, because the mean of its divisors is an integer number (43895404857).

Almost surely, 2^87790809713 is an apocalyptic number.

It is an amenable number.

87790809713 is a deficient number, since it is larger than the sum of its proper divisors (1).

87790809713 is an equidigital number, since it uses as much as digits as its factorization.

87790809713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5334336, while the sum is 59.

The spelling of 87790809713 in words is "eighty-seven billion, seven hundred ninety million, eight hundred nine thousand, seven hundred thirteen".