87780653993 has 2 divisors, whose sum is σ = 87780653994. Its totient is φ = 87780653992.

The previous prime is 87780653921. The next prime is 87780654007. The reversal of 87780653993 is 39935608778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56438554624 + 31342099369 = 237568^2 + 177037^2 .

It is a cyclic number.

It is not a de Polignac number, because 87780653993 - 2¹⁰ = 87780652969 is a prime.

It is not a weakly prime, because it can be changed into another prime (87780653393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43890326996 + 43890326997.

It is an arithmetic number, because the mean of its divisors is an integer number (43890326997).

Almost surely, 2^87780653993 is an apocalyptic number.

It is an amenable number.

87780653993 is a deficient number, since it is larger than the sum of its proper divisors (1).

87780653993 is an equidigital number, since it uses as much as digits as its factorization.

87780653993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68584320, while the sum is 65.

The spelling of 87780653993 in words is "eighty-seven billion, seven hundred eighty million, six hundred fifty-three thousand, nine hundred ninety-three".