138369555197 has 2 divisors, whose sum is σ = 138369555198. Its totient is φ = 138369555196.

The previous prime is 138369555169. The next prime is 138369555199. The reversal of 138369555197 is 791555963831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137093208121 + 1276347076 = 370261^2 + 35726^2 .

It is a cyclic number.

It is not a de Polignac number, because 138369555197 - 2¹² = 138369551101 is a prime.

It is a super-2 number, since 2×138369555197² (a number of 23 digits) contains 22 as substring.

Together with 138369555199, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138369555199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69184777598 + 69184777599.

It is an arithmetic number, because the mean of its divisors is an integer number (69184777599).

Almost surely, 2^138369555197 is an apocalyptic number.

It is an amenable number.

138369555197 is a deficient number, since it is larger than the sum of its proper divisors (1).

138369555197 is an equidigital number, since it uses as much as digits as its factorization.

138369555197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618000, while the sum is 62.

The spelling of 138369555197 in words is "one hundred thirty-eight billion, three hundred sixty-nine million, five hundred fifty-five thousand, one hundred ninety-seven".