38634891641 has 2 divisors, whose sum is σ = 38634891642. Its totient is φ = 38634891640.

The previous prime is 38634891601. The next prime is 38634891667. The reversal of 38634891641 is 14619843683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19819008400 + 18815883241 = 140780^2 + 137171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38634891641 is a prime.

It is a super-2 number, since 2×38634891641² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38634891601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19317445820 + 19317445821.

It is an arithmetic number, because the mean of its divisors is an integer number (19317445821).

Almost surely, 2^38634891641 is an apocalyptic number.

It is an amenable number.

38634891641 is a deficient number, since it is larger than the sum of its proper divisors (1).

38634891641 is an equidigital number, since it uses as much as digits as its factorization.

38634891641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 53.

The spelling of 38634891641 in words is "thirty-eight billion, six hundred thirty-four million, eight hundred ninety-one thousand, six hundred forty-one".