10805605815851 has 8 divisors (see below), whose sum is σ = 13471924134144. Its totient is φ = 8419952583720.

The previous prime is 10805605815817. The next prime is 10805605815853. The reversal of 10805605815851 is 15851850650801.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10805605815851 - 2²² = 10805601621547 is a prime.

It is a super-2 number, since 2×10805605815851² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10805605815793 and 10805605815802.

It is not an unprimeable number, because it can be changed into a prime (10805605815853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70166271455 + ... + 70166271608.

It is an arithmetic number, because the mean of its divisors is an integer number (1683990516768).

Almost surely, 2^{10805605815851} is an apocalyptic number.

10805605815851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

10805605815851 is a deficient number, since it is larger than the sum of its proper divisors (2666318318293).

10805605815851 is a wasteful number, since it uses less digits than its factorization.

10805605815851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140332543081.

The product of its (nonzero) digits is 1920000, while the sum is 53.

The spelling of 10805605815851 in words is "ten trillion, eight hundred five billion, six hundred five million, eight hundred fifteen thousand, eight hundred fifty-one".