105205920868 has 12 divisors (see below), whose sum is σ = 184115006572. Its totient is φ = 52601633280.

The previous prime is 105205920823. The next prime is 105205920887. The reversal of 105205920868 is 868029502501.

It can be written as a sum of positive squares in 2 ways, for example, as 91565549604 + 13640371264 = 302598^2 + 116792^2 .

It is a super-2 number, since 2×105205920868² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141273 + ... + 479968.

Almost surely, 2^105205920868 is an apocalyptic number.

It is an amenable number.

105205920868 is a deficient number, since it is larger than the sum of its proper divisors (78909085704).

105205920868 is a wasteful number, since it uses less digits than its factorization.

105205920868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663582 (or 663580 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 105205920868 in words is "one hundred five billion, two hundred five million, nine hundred twenty thousand, eight hundred sixty-eight".