618891686888 has 8 divisors (see below), whose sum is σ = 1160421912930. Its totient is φ = 309445843440.

The previous prime is 618891686869. The next prime is 618891686891. The reversal of 618891686888 is 888686198816.

It can be written as a sum of positive squares in only one way, i.e., 411391394404 + 207500292484 = 641398^2 + 455522^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×618891686888² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

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, 38680730423 + ... + 38680730438.

Almost surely, 2^618891686888 is an apocalyptic number.

It is an amenable number.

618891686888 is a deficient number, since it is larger than the sum of its proper divisors (541530226042).

618891686888 is a wasteful number, since it uses less digits than its factorization.

618891686888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77361460867 (or 77361460863 counting only the distinct ones).

The product of its digits is 509607936, while the sum is 77.

The spelling of 618891686888 in words is "six hundred eighteen billion, eight hundred ninety-one million, six hundred eighty-six thousand, eight hundred eighty-eight".