105866915538 has 16 divisors (see below), whose sum is σ = 211744019520. Its totient is φ = 35287273776.

The previous prime is 105866915501. The next prime is 105866915563. The reversal of 105866915538 is 835519668501.

It is a happy number.

It is a super-2 number, since 2×105866915538² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285958 + ... + 541761.

It is an arithmetic number, because the mean of its divisors is an integer number (13234001220).

Almost surely, 2^105866915538 is an apocalyptic number.

105866915538 is an abundant number, since it is smaller than the sum of its proper divisors (105877103982).

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

105866915538 is a wasteful number, since it uses less digits than its factorization.

105866915538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849041.

The product of its (nonzero) digits is 7776000, while the sum is 57.

The spelling of 105866915538 in words is "one hundred five billion, eight hundred sixty-six million, nine hundred fifteen thousand, five hundred thirty-eight".