381842636681 has 16 divisors (see below), whose sum is σ = 427309344000. Its totient is φ = 338191785600.

The previous prime is 381842636671. The next prime is 381842636689. The reversal of 381842636681 is 186636248183.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381842636681 is a prime.

It is a super-2 number, since 2×381842636681² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381842636689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264506 + ... + 913043.

It is an arithmetic number, because the mean of its divisors is an integer number (26706834000).

Almost surely, 2^381842636681 is an apocalyptic number.

It is an amenable number.

381842636681 is a deficient number, since it is larger than the sum of its proper divisors (45466707319).

381842636681 is a wasteful number, since it uses less digits than its factorization.

381842636681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178320.

The product of its digits is 7962624, while the sum is 56.

The spelling of 381842636681 in words is "three hundred eighty-one billion, eight hundred forty-two million, six hundred thirty-six thousand, six hundred eighty-one".