138017705971 has 2 divisors, whose sum is σ = 138017705972. Its totient is φ = 138017705970.

The previous prime is 138017705933. The next prime is 138017705977. The reversal of 138017705971 is 179507710831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138017705971 is a prime.

It is a super-2 number, since 2×138017705971² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138017705977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69008852985 + 69008852986.

It is an arithmetic number, because the mean of its divisors is an integer number (69008852986).

Almost surely, 2^138017705971 is an apocalyptic number.

138017705971 is a deficient number, since it is larger than the sum of its proper divisors (1).

138017705971 is an equidigital number, since it uses as much as digits as its factorization.

138017705971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 370440, while the sum is 49.

The spelling of 138017705971 in words is "one hundred thirty-eight billion, seventeen million, seven hundred five thousand, nine hundred seventy-one".