122139554258 has 18 divisors (see below), whose sum is σ = 188322958341. Its totient is φ = 59410346184.

The previous prime is 122139554239. The next prime is 122139554291. The reversal of 122139554258 is 852455931221.

It can be written as a sum of positive squares in 2 ways, for example, as 98541371569 + 23598182689 = 313913^2 + 153617^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=247123.

It is a Duffinian number.

It is an unprimeable number.

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 in 8 ways as a sum of consecutive naturals, for example, 18283763 + ... + 18290441.

Almost surely, 2^122139554258 is an apocalyptic number.

122139554258 is a deficient number, since it is larger than the sum of its proper divisors (66183404083).

122139554258 is an frugal number, since it uses more digits than its factorization.

122139554258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13434 (or 6718 counting only the distinct ones).

The product of its digits is 864000, while the sum is 47.

The spelling of 122139554258 in words is "one hundred twenty-two billion, one hundred thirty-nine million, five hundred fifty-four thousand, two hundred fifty-eight".