38436712681 has 2 divisors, whose sum is σ = 38436712682. Its totient is φ = 38436712680.

The previous prime is 38436712673. The next prime is 38436712733. The reversal of 38436712681 is 18621763483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35374086400 + 3062626281 = 188080^2 + 55341^2 .

It is a cyclic number.

It is not a de Polignac number, because 38436712681 - 2³ = 38436712673 is a prime.

It is a super-2 number, since 2×38436712681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38436712631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19218356340 + 19218356341.

It is an arithmetic number, because the mean of its divisors is an integer number (19218356341).

Almost surely, 2^38436712681 is an apocalyptic number.

It is an amenable number.

38436712681 is a deficient number, since it is larger than the sum of its proper divisors (1).

38436712681 is an equidigital number, since it uses as much as digits as its factorization.

38436712681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 49.

The spelling of 38436712681 in words is "thirty-eight billion, four hundred thirty-six million, seven hundred twelve thousand, six hundred eighty-one".