129458278257647 has 2 divisors, whose sum is σ = 129458278257648. Its totient is φ = 129458278257646.

The previous prime is 129458278257467. The next prime is 129458278257667. The reversal of 129458278257647 is 746752872854921.

It is a happy number.

Together with previous prime (129458278257467) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129458278257647 - 2¹⁸ = 129458277995503 is a prime.

It is a super-2 number, since 2×129458278257647² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129458278257667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64729139128823 + 64729139128824.

It is an arithmetic number, because the mean of its divisors is an integer number (64729139128824).

Almost surely, 2^{129458278257647} is an apocalyptic number.

129458278257647 is a deficient number, since it is larger than the sum of its proper divisors (1).

129458278257647 is an equidigital number, since it uses as much as digits as its factorization.

129458278257647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3793305600, while the sum is 77.

The spelling of 129458278257647 in words is "one hundred twenty-nine trillion, four hundred fifty-eight billion, two hundred seventy-eight million, two hundred fifty-seven thousand, six hundred forty-seven".