186440681729 has 2 divisors, whose sum is σ = 186440681730. Its totient is φ = 186440681728.

The previous prime is 186440681723. The next prime is 186440681743. The reversal of 186440681729 is 927186044681.

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., 130566595600 + 55874086129 = 361340^2 + 236377^2 .

It is a cyclic number.

It is not a de Polignac number, because 186440681729 - 2³² = 182145714433 is a prime.

It is not a weakly prime, because it can be changed into another prime (186440681723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93220340864 + 93220340865.

It is an arithmetic number, because the mean of its divisors is an integer number (93220340865).

Almost surely, 2^186440681729 is an apocalyptic number.

It is an amenable number.

186440681729 is a deficient number, since it is larger than the sum of its proper divisors (1).

186440681729 is an equidigital number, since it uses as much as digits as its factorization.

186440681729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4644864, while the sum is 56.

The spelling of 186440681729 in words is "one hundred eighty-six billion, four hundred forty million, six hundred eighty-one thousand, seven hundred twenty-nine".