18590349805 has 8 divisors (see below), whose sum is σ = 23077675800. Its totient is φ = 14359442496.

The previous prime is 18590349781. The next prime is 18590349851. The reversal of 18590349805 is 50894309581.

It can be written as a sum of positive squares in 4 ways, for example, as 1401304356 + 17189045449 = 37434^2 + 131107^2 .

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 18590349805 - 2⁵ = 18590349773 is a prime.

It is a super-2 number, since 2×18590349805² (a number of 21 digits) contains 22 as substring.

It is a congruent 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, 64104510 + ... + 64104799.

It is an arithmetic number, because the mean of its divisors is an integer number (2884709475).

Almost surely, 2^18590349805 is an apocalyptic number.

It is an amenable number.

18590349805 is a deficient number, since it is larger than the sum of its proper divisors (4487325995).

18590349805 is a wasteful number, since it uses less digits than its factorization.

18590349805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128209343.

The product of its (nonzero) digits is 1555200, while the sum is 52.

The spelling of 18590349805 in words is "eighteen billion, five hundred ninety million, three hundred forty-nine thousand, eight hundred five".