381586666661 has 24 divisors (see below), whose sum is σ = 407292732000. Its totient is φ = 357223027392.

The previous prime is 381586666633. The next prime is 381586666667. The reversal of 381586666661 is 166666685183.

It is not a de Polignac number, because 381586666661 - 2¹⁰ = 381586665637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 381586666594 and 381586666603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381586666667) 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 23 ways as a sum of consecutive naturals, for example, 3895715 + ... + 3992463.

It is an arithmetic number, because the mean of its divisors is an integer number (16970530500).

Almost surely, 2^381586666661 is an apocalyptic number.

It is an amenable number.

381586666661 is a deficient number, since it is larger than the sum of its proper divisors (25706065339).

381586666661 is an equidigital number, since it uses as much as digits as its factorization.

381586666661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96933 (or 96896 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 62.

The spelling of 381586666661 in words is "three hundred eighty-one billion, five hundred eighty-six million, six hundred sixty-six thousand, six hundred sixty-one".