79129447123 has 2 divisors, whose sum is σ = 79129447124. Its totient is φ = 79129447122.

The previous prime is 79129447121. The next prime is 79129447129. The reversal of 79129447123 is 32174492197.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79129447123 - 2¹ = 79129447121 is a prime.

It is a super-2 number, since 2×79129447123² (a number of 23 digits) contains 22 as substring.

Together with 79129447121, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (79129447121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39564723561 + 39564723562.

It is an arithmetic number, because the mean of its divisors is an integer number (39564723562).

Almost surely, 2^79129447123 is an apocalyptic number.

79129447123 is a deficient number, since it is larger than the sum of its proper divisors (1).

79129447123 is an equidigital number, since it uses as much as digits as its factorization.

79129447123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 49.

The spelling of 79129447123 in words is "seventy-nine billion, one hundred twenty-nine million, four hundred forty-seven thousand, one hundred twenty-three".