18712671522709 has 2 divisors, whose sum is σ = 18712671522710. Its totient is φ = 18712671522708.

The previous prime is 18712671522637. The next prime is 18712671522799. The reversal of 18712671522709 is 90722517621781.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14982666855025 + 3730004667684 = 3870745^2 + 1931322^2 .

It is a cyclic number.

It is not a de Polignac number, because 18712671522709 - 2²¹ = 18712669425557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18712671522799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9356335761354 + 9356335761355.

It is an arithmetic number, because the mean of its divisors is an integer number (9356335761355).

Almost surely, 2^{18712671522709} is an apocalyptic number.

It is an amenable number.

18712671522709 is a deficient number, since it is larger than the sum of its proper divisors (1).

18712671522709 is an equidigital number, since it uses as much as digits as its factorization.

18712671522709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5927040, while the sum is 58.

The spelling of 18712671522709 in words is "eighteen trillion, seven hundred twelve billion, six hundred seventy-one million, five hundred twenty-two thousand, seven hundred nine".