988185518217 has 12 divisors (see below), whose sum is σ = 1431614632500. Its totient is φ = 656835475968.

The previous prime is 988185518191. The next prime is 988185518239. The reversal of 988185518217 is 712815581889.

988185518217 is a `hidden beast` number, since 9 + 88 + 18 + 5 + 518 + 21 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 559951393401 + 428234124816 = 748299^2 + 654396^2 .

It is not a de Polignac number, because 988185518217 - 2⁶ = 988185518153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (988185510217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162902592 + ... + 162908657.

It is an arithmetic number, because the mean of its divisors is an integer number (119301219375).

Almost surely, 2^988185518217 is an apocalyptic number.

It is an amenable number.

988185518217 is a deficient number, since it is larger than the sum of its proper divisors (443429114283).

988185518217 is a wasteful number, since it uses less digits than its factorization.

988185518217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325811592 (or 325811589 counting only the distinct ones).

The product of its digits is 12902400, while the sum is 63.

The spelling of 988185518217 in words is "nine hundred eighty-eight billion, one hundred eighty-five million, five hundred eighteen thousand, two hundred seventeen".