12155719687 has 2 divisors, whose sum is σ = 12155719688. Its totient is φ = 12155719686.

The previous prime is 12155719679. The next prime is 12155719739. The reversal of 12155719687 is 78691755121.

It is an a-pointer prime, because the next prime (12155719739) can be obtained adding 12155719687 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12155719687 - 2³ = 12155719679 is a prime.

It is a super-2 number, since 2×12155719687² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12155719607) 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, 6077859843 + 6077859844.

It is an arithmetic number, because the mean of its divisors is an integer number (6077859844).

Almost surely, 2^12155719687 is an apocalyptic number.

12155719687 is a deficient number, since it is larger than the sum of its proper divisors (1).

12155719687 is an equidigital number, since it uses as much as digits as its factorization.

12155719687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058400, while the sum is 52.

The spelling of 12155719687 in words is "twelve billion, one hundred fifty-five million, seven hundred nineteen thousand, six hundred eighty-seven".