138548220997 has 2 divisors, whose sum is σ = 138548220998. Its totient is φ = 138548220996.

The previous prime is 138548220973. The next prime is 138548221013. The reversal of 138548220997 is 799022845831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137755291716 + 792929281 = 371154^2 + 28159^2 .

It is a cyclic number.

It is not a de Polignac number, because 138548220997 - 2⁷ = 138548220869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138542220997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69274110498 + 69274110499.

It is an arithmetic number, because the mean of its divisors is an integer number (69274110499).

Almost surely, 2^138548220997 is an apocalyptic number.

It is an amenable number.

138548220997 is a deficient number, since it is larger than the sum of its proper divisors (1).

138548220997 is an equidigital number, since it uses as much as digits as its factorization.

138548220997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 138548220997 in words is "one hundred thirty-eight billion, five hundred forty-eight million, two hundred twenty thousand, nine hundred ninety-seven".