18611420511 has 8 divisors (see below), whose sum is σ = 24822253440. Its totient is φ = 12404100632.

The previous prime is 18611420491. The next prime is 18611420533. The reversal of 18611420511 is 11502411681.

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 18611420511 - 2²² = 18607226207 is a prime.

It is a super-2 number, since 2×18611420511² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18611420551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865875 + ... + 887108.

It is an arithmetic number, because the mean of its divisors is an integer number (3102781680).

Almost surely, 2^18611420511 is an apocalyptic number.

18611420511 is a deficient number, since it is larger than the sum of its proper divisors (6210832929).

18611420511 is a wasteful number, since it uses less digits than its factorization.

18611420511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756525.

The product of its (nonzero) digits is 1920, while the sum is 30.

The spelling of 18611420511 in words is "eighteen billion, six hundred eleven million, four hundred twenty thousand, five hundred eleven".