122139645157 has 2 divisors, whose sum is σ = 122139645158. Its totient is φ = 122139645156.

The previous prime is 122139645113. The next prime is 122139645161. The reversal of 122139645157 is 751546931221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64655267076 + 57484378081 = 254274^2 + 239759^2 .

It is a cyclic number.

It is not a de Polignac number, because 122139645157 - 2⁷ = 122139645029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122139645557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61069822578 + 61069822579.

It is an arithmetic number, because the mean of its divisors is an integer number (61069822579).

Almost surely, 2^122139645157 is an apocalyptic number.

It is an amenable number.

122139645157 is a deficient number, since it is larger than the sum of its proper divisors (1).

122139645157 is an equidigital number, since it uses as much as digits as its factorization.

122139645157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 46.

The spelling of 122139645157 in words is "one hundred twenty-two billion, one hundred thirty-nine million, six hundred forty-five thousand, one hundred fifty-seven".