18640555539332 has 6 divisors (see below), whose sum is σ = 32620972193838. Its totient is φ = 9320277769664.

The previous prime is 18640555539301. The next prime is 18640555539373. The reversal of 18640555539332 is 23393555504681.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17715546312256 + 925009227076 = 4208984^2 + 961774^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2330069442413 + ... + 2330069442420.

It is an arithmetic number, because the mean of its divisors is an integer number (5436828698973).

Almost surely, 2^{18640555539332} is an apocalyptic number.

It is an amenable number.

18640555539332 is a deficient number, since it is larger than the sum of its proper divisors (13980416654506).

18640555539332 is a wasteful number, since it uses less digits than its factorization.

18640555539332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4660138884837 (or 4660138884835 counting only the distinct ones).

The product of its (nonzero) digits is 58320000, while the sum is 59.

The spelling of 18640555539332 in words is "eighteen trillion, six hundred forty billion, five hundred fifty-five million, five hundred thirty-nine thousand, three hundred thirty-two".