126640815671 has 2 divisors, whose sum is σ = 126640815672. Its totient is φ = 126640815670.

The previous prime is 126640815659. The next prime is 126640815701. The reversal of 126640815671 is 176518046621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126640815671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126640815601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63320407835 + 63320407836.

It is an arithmetic number, because the mean of its divisors is an integer number (63320407836).

Almost surely, 2^126640815671 is an apocalyptic number.

126640815671 is a deficient number, since it is larger than the sum of its proper divisors (1).

126640815671 is an equidigital number, since it uses as much as digits as its factorization.

126640815671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 126640815671 in words is "one hundred twenty-six billion, six hundred forty million, eight hundred fifteen thousand, six hundred seventy-one".