189440444555 has 8 divisors (see below), whose sum is σ = 233472548112. Its totient is φ = 147456345888.

The previous prime is 189440444549. The next prime is 189440444603. The reversal of 189440444555 is 555444044981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189440444555 - 2¹² = 189440440459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189440444497 and 189440444506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512001017 + ... + 512001386.

It is an arithmetic number, because the mean of its divisors is an integer number (29184068514).

Almost surely, 2^189440444555 is an apocalyptic number.

189440444555 is a deficient number, since it is larger than the sum of its proper divisors (44032103557).

189440444555 is a wasteful number, since it uses less digits than its factorization.

189440444555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024002445.

The product of its (nonzero) digits is 9216000, while the sum is 53.

The spelling of 189440444555 in words is "one hundred eighty-nine billion, four hundred forty million, four hundred forty-four thousand, five hundred fifty-five".