381275671866 has 32 divisors (see below), whose sum is σ = 807442110720. Its totient is φ = 119610740736.

The previous prime is 381275671859. The next prime is 381275671867. The reversal of 381275671866 is 668176572183.

It is a super-2 number, since 2×381275671866² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381275671867) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2799375 + ... + 2932413.

It is an arithmetic number, because the mean of its divisors is an integer number (25232565960).

Almost surely, 2^381275671866 is an apocalyptic number.

381275671866 is an abundant number, since it is smaller than the sum of its proper divisors (426166438854).

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

381275671866 is a wasteful number, since it uses less digits than its factorization.

381275671866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161158.

The product of its digits is 20321280, while the sum is 60.

The spelling of 381275671866 in words is "three hundred eighty-one billion, two hundred seventy-five million, six hundred seventy-one thousand, eight hundred sixty-six".