380636605681 has 8 divisors (see below), whose sum is σ = 384020969544. Its totient is φ = 377252520960.

The previous prime is 380636605637. The next prime is 380636605709. The reversal of 380636605681 is 186506636083.

It can be written as a sum of positive squares in 4 ways, for example, as 52536765681 + 328099840000 = 229209^2 + 572800^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-380636605681 is a prime.

It is a super-2 number, since 2×380636605681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (380636675681) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3457965 + ... + 3566341.

It is an arithmetic number, because the mean of its divisors is an integer number (48002621193).

Almost surely, 2^380636605681 is an apocalyptic number.

It is an amenable number.

380636605681 is a deficient number, since it is larger than the sum of its proper divisors (3384363863).

380636605681 is a wasteful number, since it uses less digits than its factorization.

380636605681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139571.

The product of its (nonzero) digits is 3732480, while the sum is 52.

The spelling of 380636605681 in words is "three hundred eighty billion, six hundred thirty-six million, six hundred five thousand, six hundred eighty-one".