18498742881 has 8 divisors (see below), whose sum is σ = 24828335424. Its totient is φ = 12250822800.

The previous prime is 18498742879. The next prime is 18498742919. The reversal of 18498742881 is 18824789481.

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

It is not a de Polignac number, because 18498742881 - 2¹ = 18498742879 is a prime.

It is a super-2 number, since 2×18498742881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18498742861) 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, 20417586 + ... + 20418491.

It is an arithmetic number, because the mean of its divisors is an integer number (3103541928).

Almost surely, 2^18498742881 is an apocalyptic number.

It is an amenable number.

18498742881 is a deficient number, since it is larger than the sum of its proper divisors (6329592543).

18498742881 is a wasteful number, since it uses less digits than its factorization.

18498742881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40836231.

The product of its digits is 8257536, while the sum is 60.

The spelling of 18498742881 in words is "eighteen billion, four hundred ninety-eight million, seven hundred forty-two thousand, eight hundred eighty-one".