18611205490 has 8 divisors (see below), whose sum is σ = 33500169900. Its totient is φ = 7444482192.

The previous prime is 18611205439. The next prime is 18611205497. The reversal of 18611205490 is 9450211681.

It can be written as a sum of positive squares in 2 ways, for example, as 17393125689 + 1218079801 = 131883^2 + 34901^2 .

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

It is a super-2 number, since 2×18611205490² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18611205497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 930560265 + ... + 930560284.

Almost surely, 2^18611205490 is an apocalyptic number.

18611205490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18611205490 is a deficient number, since it is larger than the sum of its proper divisors (14888964410).

18611205490 is a wasteful number, since it uses less digits than its factorization.

18611205490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861120556.

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 18611205490 in words is "eighteen billion, six hundred eleven million, two hundred five thousand, four hundred ninety".