163556894987 has 2 divisors, whose sum is σ = 163556894988. Its totient is φ = 163556894986.

The previous prime is 163556894933. The next prime is 163556895041. The reversal of 163556894987 is 789498655361.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (163556894933) and next prime (163556895041).

It is a cyclic number.

It is not a de Polignac number, because 163556894987 - 2⁸ = 163556894731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163556894987.

It is not a weakly prime, because it can be changed into another prime (163556894887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81778447493 + 81778447494.

It is an arithmetic number, because the mean of its divisors is an integer number (81778447494).

Almost surely, 2^163556894987 is an apocalyptic number.

163556894987 is a deficient number, since it is larger than the sum of its proper divisors (1).

163556894987 is an equidigital number, since it uses as much as digits as its factorization.

163556894987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 391910400, while the sum is 71.

The spelling of 163556894987 in words is "one hundred sixty-three billion, five hundred fifty-six million, eight hundred ninety-four thousand, nine hundred eighty-seven".