38491647811 has 2 divisors, whose sum is σ = 38491647812. Its totient is φ = 38491647810.

The previous prime is 38491647787. The next prime is 38491647841. The reversal of 38491647811 is 11874619483.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38491647811 - 2¹¹ = 38491645763 is a prime.

It is a super-2 number, since 2×38491647811² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38491647841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19245823905 + 19245823906.

It is an arithmetic number, because the mean of its divisors is an integer number (19245823906).

Almost surely, 2^38491647811 is an apocalyptic number.

38491647811 is a deficient number, since it is larger than the sum of its proper divisors (1).

38491647811 is an equidigital number, since it uses as much as digits as its factorization.

38491647811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 52.

The spelling of 38491647811 in words is "thirty-eight billion, four hundred ninety-one million, six hundred forty-seven thousand, eight hundred eleven".