61443331218 has 32 divisors (see below), whose sum is σ = 136557462720. Its totient is φ = 20478601440.

The previous prime is 61443331189. The next prime is 61443331219. The reversal of 61443331218 is 81213334416.

61443331218 is a `hidden beast` number, since 6 + 1 + 4 + 433 + 3 + 1 + 218 = 666.

61443331218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (61443331219) 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, 404838 + ... + 535518.

It is an arithmetic number, because the mean of its divisors is an integer number (4267420710).

Almost surely, 2^61443331218 is an apocalyptic number.

61443331218 is an abundant number, since it is smaller than the sum of its proper divisors (75114131502).

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

61443331218 is a wasteful number, since it uses less digits than its factorization.

61443331218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139399 (or 139393 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The spelling of 61443331218 in words is "sixty-one billion, four hundred forty-three million, three hundred thirty-one thousand, two hundred eighteen".