18251339776836 has 48 divisors (see below), whose sum is σ = 44754594798144. Its totient is φ = 5781694052736.

The previous prime is 18251339776777. The next prime is 18251339776847. The reversal of 18251339776836 is 63867793315281.

It is a super-2 number, since 2×18251339776836² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477964875 + ... + 478003058.

It is an arithmetic number, because the mean of its divisors is an integer number (932387391628).

Almost surely, 2^{18251339776836} is an apocalyptic number.

It is an amenable number.

18251339776836 is an abundant number, since it is smaller than the sum of its proper divisors (26503255021308).

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

18251339776836 is a wasteful number, since it uses less digits than its factorization.

18251339776836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955968020 (or 955968018 counting only the distinct ones).

The product of its digits is 274337280, while the sum is 69.

The spelling of 18251339776836 in words is "eighteen trillion, two hundred fifty-one billion, three hundred thirty-nine million, seven hundred seventy-six thousand, eight hundred thirty-six".