129918918887 has 4 divisors (see below), whose sum is σ = 129920347536. Its totient is φ = 129917490240.

The previous prime is 129918918863. The next prime is 129918918893. The reversal of 129918918887 is 788819819921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129918918887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129918918887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129918918487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567914 + ... + 763127.

It is an arithmetic number, because the mean of its divisors is an integer number (32480086884).

Almost surely, 2^129918918887 is an apocalyptic number.

129918918887 is a deficient number, since it is larger than the sum of its proper divisors (1428649).

129918918887 is an equidigital number, since it uses as much as digits as its factorization.

129918918887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428648.

The product of its digits is 41803776, while the sum is 71.

The spelling of 129918918887 in words is "one hundred twenty-nine billion, nine hundred eighteen million, nine hundred eighteen thousand, eight hundred eighty-seven".