129011774991 has 64 divisors (see below), whose sum is σ = 201465200640. Its totient is φ = 72693936000.

The previous prime is 129011774987. The next prime is 129011774993. The reversal of 129011774991 is 199477110921.

It is a happy number.

It is not a de Polignac number, because 129011774991 - 2² = 129011774987 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129011774993) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2659290 + ... + 2707368.

It is an arithmetic number, because the mean of its divisors is an integer number (3147893760).

Almost surely, 2^129011774991 is an apocalyptic number.

129011774991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

129011774991 is a deficient number, since it is larger than the sum of its proper divisors (72453425649).

129011774991 is a wasteful number, since it uses less digits than its factorization.

129011774991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48228.

The product of its (nonzero) digits is 285768, while the sum is 51.

The spelling of 129011774991 in words is "one hundred twenty-nine billion, eleven million, seven hundred seventy-four thousand, nine hundred ninety-one".