38491395814681 has 2 divisors, whose sum is σ = 38491395814682. Its totient is φ = 38491395814680.

The previous prime is 38491395814657. The next prime is 38491395814687. The reversal of 38491395814681 is 18641859319483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29624942694400 + 8866453120281 = 5442880^2 + 2977659^2 .

It is a cyclic number.

It is not a de Polignac number, because 38491395814681 - 2²¹ = 38491393717529 is a prime.

It is a super-2 number, since 2×38491395814681² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 38491395814681.

It is not a weakly prime, because it can be changed into another prime (38491395814687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19245697907340 + 19245697907341.

It is an arithmetic number, because the mean of its divisors is an integer number (19245697907341).

Almost surely, 2^{38491395814681} is an apocalyptic number.

It is an amenable number.

38491395814681 is a deficient number, since it is larger than the sum of its proper divisors (1).

38491395814681 is an equidigital number, since it uses as much as digits as its factorization.

38491395814681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 179159040, while the sum is 70.

The spelling of 38491395814681 in words is "thirty-eight trillion, four hundred ninety-one billion, three hundred ninety-five million, eight hundred fourteen thousand, six hundred eighty-one".