129186409616 has 80 divisors (see below), whose sum is σ = 285831991296. Its totient is φ = 56026320000.

The previous prime is 129186409613. The next prime is 129186409697. The reversal of 129186409616 is 616904681921.

It is not an unprimeable number, because it can be changed into a prime (129186409613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220631 + ... + 554121.

Almost surely, 2^129186409616 is an apocalyptic number.

129186409616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129186409616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142915995648).

129186409616 is an abundant number, since it is smaller than the sum of its proper divisors (156645581680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129186409616 is a wasteful number, since it uses less digits than its factorization.

129186409616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333612 (or 333606 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 53.

The spelling of 129186409616 in words is "one hundred twenty-nine billion, one hundred eighty-six million, four hundred nine thousand, six hundred sixteen".