129455665491 has 8 divisors (see below), whose sum is σ = 172611038160. Its totient is φ = 86302034912.

The previous prime is 129455665489. The next prime is 129455665517. The reversal of 129455665491 is 194566554921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129455665491 - 2¹ = 129455665489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129455665421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250956 + ... + 567353.

It is an arithmetic number, because the mean of its divisors is an integer number (21576379770).

Almost surely, 2^129455665491 is an apocalyptic number.

129455665491 is a deficient number, since it is larger than the sum of its proper divisors (43155372669).

129455665491 is an equidigital number, since it uses as much as digits as its factorization.

129455665491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871045.

The product of its digits is 11664000, while the sum is 57.

The spelling of 129455665491 in words is "one hundred twenty-nine billion, four hundred fifty-five million, six hundred sixty-five thousand, four hundred ninety-one".