138455901973 has 2 divisors, whose sum is σ = 138455901974. Its totient is φ = 138455901972.

The previous prime is 138455901967. The next prime is 138455902033. The reversal of 138455901973 is 379109554831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78889642129 + 59566259844 = 280873^2 + 244062^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138455901973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138455901173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69227950986 + 69227950987.

It is an arithmetic number, because the mean of its divisors is an integer number (69227950987).

Almost surely, 2^138455901973 is an apocalyptic number.

It is an amenable number.

138455901973 is a deficient number, since it is larger than the sum of its proper divisors (1).

138455901973 is an equidigital number, since it uses as much as digits as its factorization.

138455901973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4082400, while the sum is 55.

The spelling of 138455901973 in words is "one hundred thirty-eight billion, four hundred fifty-five million, nine hundred one thousand, nine hundred seventy-three".