87645668969 has 2 divisors, whose sum is σ = 87645668970. Its totient is φ = 87645668968.

The previous prime is 87645668947. The next prime is 87645669017. The reversal of 87645668969 is 96986654678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53841169369 + 33804499600 = 232037^2 + 183860^2 .

It is a cyclic number.

It is not a de Polignac number, because 87645668969 - 2⁸ = 87645668713 is a prime.

It is a super-2 number, since 2×87645668969² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87645668896 and 87645668905.

It is not a weakly prime, because it can be changed into another prime (87645668939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43822834484 + 43822834485.

It is an arithmetic number, because the mean of its divisors is an integer number (43822834485).

Almost surely, 2^87645668969 is an apocalyptic number.

It is an amenable number.

87645668969 is a deficient number, since it is larger than the sum of its proper divisors (1).

87645668969 is an equidigital number, since it uses as much as digits as its factorization.

87645668969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 940584960, while the sum is 74.

The spelling of 87645668969 in words is "eighty-seven billion, six hundred forty-five million, six hundred sixty-eight thousand, nine hundred sixty-nine".