12155620117 has 2 divisors, whose sum is σ = 12155620118. Its totient is φ = 12155620116.

The previous prime is 12155620069. The next prime is 12155620171. The reversal of 12155620117 is 71102655121.

Together with next prime (12155620171) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11856814321 + 298805796 = 108889^2 + 17286^2 .

It is a cyclic number.

It is not a de Polignac number, because 12155620117 - 2⁷ = 12155619989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12155627117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077810058 + 6077810059.

It is an arithmetic number, because the mean of its divisors is an integer number (6077810059).

Almost surely, 2^12155620117 is an apocalyptic number.

It is an amenable number.

12155620117 is a deficient number, since it is larger than the sum of its proper divisors (1).

12155620117 is an equidigital number, since it uses as much as digits as its factorization.

12155620117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 12155620117 in words is "twelve billion, one hundred fifty-five million, six hundred twenty thousand, one hundred seventeen".