381818199636 has 72 divisors (see below), whose sum is σ = 975052600704. Its totient is φ = 125968449600.

The previous prime is 381818199613. The next prime is 381818199641. The reversal of 381818199636 is 636991818183.

381818199636 is a `hidden beast` number, since 381 + 8 + 1 + 8 + 199 + 63 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7021825 + ... + 7075991.

It is an arithmetic number, because the mean of its divisors is an integer number (13542397232).

Almost surely, 2^381818199636 is an apocalyptic number.

381818199636 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

381818199636 is an abundant number, since it is smaller than the sum of its proper divisors (593234401068).

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

381818199636 is a wasteful number, since it uses less digits than its factorization.

381818199636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56181 (or 56176 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 63.

The spelling of 381818199636 in words is "three hundred eighty-one billion, eight hundred eighteen million, one hundred ninety-nine thousand, six hundred thirty-six".