18771394458 has 48 divisors (see below), whose sum is σ = 40535110944. Its totient is φ = 5792490240.

The previous prime is 18771394399. The next prime is 18771394469. The reversal of 18771394458 is 85449317781.

It is a super-2 number, since 2×18771394458² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18771394398 and 18771394407.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17041 + ... + 194507.

It is an arithmetic number, because the mean of its divisors is an integer number (844481478).

Almost surely, 2^18771394458 is an apocalyptic number.

18771394458 is an abundant number, since it is smaller than the sum of its proper divisors (21763716486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18771394458 is a wasteful number, since it uses less digits than its factorization.

18771394458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177567 (or 177550 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 57.

The spelling of 18771394458 in words is "eighteen billion, seven hundred seventy-one million, three hundred ninety-four thousand, four hundred fifty-eight".