18419473081 has 16 divisors (see below), whose sum is σ = 19807603200. Its totient is φ = 17095708800.

The previous prime is 18419473057. The next prime is 18419473153. The reversal of 18419473081 is 18037491481.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18419473081 is a prime.

It is a super-2 number, since 2×18419473081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18419473381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47826 + ... + 197803.

It is an arithmetic number, because the mean of its divisors is an integer number (1237975200).

Almost surely, 2^18419473081 is an apocalyptic number.

It is an amenable number.

18419473081 is a deficient number, since it is larger than the sum of its proper divisors (1388130119).

18419473081 is a wasteful number, since it uses less digits than its factorization.

18419473081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245760.

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 18419473081 in words is "eighteen billion, four hundred nineteen million, four hundred seventy-three thousand, eighty-one".