189018505720 has 32 divisors (see below), whose sum is σ = 463954515120. Its totient is φ = 68734001920.

The previous prime is 189018505699. The next prime is 189018505721. The reversal of 189018505720 is 27505810981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189018505721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214793317 + ... + 214794196.

Almost surely, 2^189018505720 is an apocalyptic number.

189018505720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189018505720 is an abundant number, since it is smaller than the sum of its proper divisors (274936009400).

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

189018505720 is a wasteful number, since it uses less digits than its factorization.

189018505720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429587535 (or 429587531 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 46.

The spelling of 189018505720 in words is "one hundred eighty-nine billion, eighteen million, five hundred five thousand, seven hundred twenty".