87765138193 has 2 divisors, whose sum is σ = 87765138194. Its totient is φ = 87765138192.

The previous prime is 87765138163. The next prime is 87765138269. The reversal of 87765138193 is 39183156778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51296361169 + 36468777024 = 226487^2 + 190968^2 .

It is a cyclic number.

It is not a de Polignac number, because 87765138193 - 2²⁹ = 87228267281 is a prime.

It is not a weakly prime, because it can be changed into another prime (87765138103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43882569096 + 43882569097.

It is an arithmetic number, because the mean of its divisors is an integer number (43882569097).

Almost surely, 2^87765138193 is an apocalyptic number.

It is an amenable number.

87765138193 is a deficient number, since it is larger than the sum of its proper divisors (1).

87765138193 is an equidigital number, since it uses as much as digits as its factorization.

87765138193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 58.

The spelling of 87765138193 in words is "eighty-seven billion, seven hundred sixty-five million, one hundred thirty-eight thousand, one hundred ninety-three".