13129387550 has 12 divisors (see below), whose sum is σ = 24420660936. Its totient is φ = 5251755000.

The previous prime is 13129387549. The next prime is 13129387553. The reversal of 13129387550 is 5578392131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13129387553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 131293826 + ... + 131293925.

It is an arithmetic number, because the mean of its divisors is an integer number (2035055078).

Almost surely, 2^13129387550 is an apocalyptic number.

13129387550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13129387550 is a deficient number, since it is larger than the sum of its proper divisors (11291273386).

13129387550 is a wasteful number, since it uses less digits than its factorization.

13129387550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262587763 (or 262587758 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 13129387550 in words is "thirteen billion, one hundred twenty-nine million, three hundred eighty-seven thousand, five hundred fifty".