381818199637 has 32 divisors (see below), whose sum is σ = 449780539392. Its totient is φ = 317276460864.

The previous prime is 381818199613. The next prime is 381818199641. The reversal of 381818199637 is 736991818183.

It is a cyclic number.

It is not a de Polignac number, because 381818199637 - 2¹¹ = 381818197589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381818199677) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92515068 + ... + 92519194.

It is an arithmetic number, because the mean of its divisors is an integer number (14055641856).

Almost surely, 2^381818199637 is an apocalyptic number.

381818199637 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

381818199637 is a deficient number, since it is larger than the sum of its proper divisors (67962339755).

381818199637 is a wasteful number, since it uses less digits than its factorization.

381818199637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5377.

The product of its digits is 15676416, while the sum is 64.

The spelling of 381818199637 in words is "three hundred eighty-one billion, eight hundred eighteen million, one hundred ninety-nine thousand, six hundred thirty-seven".