381505117866 has 16 divisors (see below), whose sum is σ = 763149765888. Its totient is φ = 127145117600.

The previous prime is 381505117817. The next prime is 381505117867. The reversal of 381505117866 is 668711505183.

It is not an unprimeable number, because it can be changed into a prime (381505117867) 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, 5778195 + ... + 5843846.

It is an arithmetic number, because the mean of its divisors is an integer number (47696860368).

Almost surely, 2^381505117866 is an apocalyptic number.

381505117866 is an abundant number, since it is smaller than the sum of its proper divisors (381644648022).

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

381505117866 is a wasteful number, since it uses less digits than its factorization.

381505117866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11627517.

The product of its (nonzero) digits is 1209600, while the sum is 51.

The spelling of 381505117866 in words is "three hundred eighty-one billion, five hundred five million, one hundred seventeen thousand, eight hundred sixty-six".