1806408743785 has 16 divisors (see below), whose sum is σ = 2216563653456. Its totient is φ = 1412741760768.

The previous prime is 1806408743717. The next prime is 1806408743791. The reversal of 1806408743785 is 5873478046081.

It can be written as a sum of positive squares in 8 ways, for example, as 220272526224 + 1586136217561 = 469332^2 + 1259419^2 .

It is a cyclic number.

It is not a de Polignac number, because 1806408743785 - 2²¹ = 1806406646633 is a prime.

It is a super-2 number, since 2×1806408743785² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 12230994 + ... + 12377803.

It is an arithmetic number, because the mean of its divisors is an integer number (138535228341).

Almost surely, 2^{1806408743785} is an apocalyptic number.

It is an amenable number.

1806408743785 is a deficient number, since it is larger than the sum of its proper divisors (410154909671).

1806408743785 is a wasteful number, since it uses less digits than its factorization.

1806408743785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24609132.

The product of its (nonzero) digits is 36126720, while the sum is 61.

The spelling of 1806408743785 in words is "one trillion, eight hundred six billion, four hundred eight million, seven hundred forty-three thousand, seven hundred eighty-five".