87163161813 has 36 divisors (see below), whose sum is σ = 157723826988. Its totient is φ = 45976170240.

The previous prime is 87163161781. The next prime is 87163161817. The reversal of 87163161813 is 31816136178.

87163161813 is a `hidden beast` number, since 8 + 7 + 1 + 631 + 6 + 1 + 8 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9646579089 + 77516582724 = 98217^2 + 278418^2 .

It is not a de Polignac number, because 87163161813 - 2⁵ = 87163161781 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87163161817) 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 in 35 ways as a sum of consecutive naturals, for example, 7596148 + ... + 7607613.

Almost surely, 2^87163161813 is an apocalyptic number.

It is an amenable number.

87163161813 is a deficient number, since it is larger than the sum of its proper divisors (70560665175).

87163161813 is a wasteful number, since it uses less digits than its factorization.

87163161813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15203794 (or 15203784 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The spelling of 87163161813 in words is "eighty-seven billion, one hundred sixty-three million, one hundred sixty-one thousand, eight hundred thirteen".