381948721686 has 48 divisors (see below), whose sum is σ = 976286757888. Its totient is φ = 105607940400.

The previous prime is 381948721669. The next prime is 381948721699. The reversal of 381948721686 is 686127849183.

381948721686 is a `hidden beast` number, since 381 + 94 + 8 + 7 + 2 + 168 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48888660 + ... + 48896471.

It is an arithmetic number, because the mean of its divisors is an integer number (20339307456).

Almost surely, 2^381948721686 is an apocalyptic number.

381948721686 is an abundant number, since it is smaller than the sum of its proper divisors (594338036202).

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

381948721686 is a wasteful number, since it uses less digits than its factorization.

381948721686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97785177 (or 97785174 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 63.

The spelling of 381948721686 in words is "three hundred eighty-one billion, nine hundred forty-eight million, seven hundred twenty-one thousand, six hundred eighty-six".