8661219138 has 64 divisors (see below), whose sum is σ = 22612060800. Its totient is φ = 2422716480.

The previous prime is 8661219097. The next prime is 8661219163. The reversal of 8661219138 is 8319121668.

8661219138 is a `hidden beast` number, since 8 + 6 + 612 + 19 + 13 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 8661219093 and 8661219102.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 553093 + ... + 568536.

It is an arithmetic number, because the mean of its divisors is an integer number (353313450).

Almost surely, 2^8661219138 is an apocalyptic number.

8661219138 is an abundant number, since it is smaller than the sum of its proper divisors (13950841662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8661219138 is a wasteful number, since it uses less digits than its factorization.

8661219138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121664 (or 1121658 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 8661219138 is about 93065.6711037964. The cubic root of 8661219138 is about 2053.6495875100.

The spelling of 8661219138 in words is "eight billion, six hundred sixty-one million, two hundred nineteen thousand, one hundred thirty-eight".