18129555572 has 6 divisors (see below), whose sum is σ = 31726722258. Its totient is φ = 9064777784.

The previous prime is 18129555547. The next prime is 18129555607. The reversal of 18129555572 is 27555592181.

It can be written as a sum of positive squares in only one way, i.e., 15786414736 + 2343140836 = 125644^2 + 48406^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18129555572.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2266194443 + ... + 2266194450.

It is an arithmetic number, because the mean of its divisors is an integer number (5287787043).

Almost surely, 2^18129555572 is an apocalyptic number.

It is an amenable number.

18129555572 is a deficient number, since it is larger than the sum of its proper divisors (13597166686).

18129555572 is a wasteful number, since it uses less digits than its factorization.

18129555572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4532388897 (or 4532388895 counting only the distinct ones).

The product of its digits is 1260000, while the sum is 50.

The spelling of 18129555572 in words is "eighteen billion, one hundred twenty-nine million, five hundred fifty-five thousand, five hundred seventy-two".