189950903064 has 128 divisors (see below), whose sum is σ = 568371384000. Its totient is φ = 58431808512.

The previous prime is 189950903063. The next prime is 189950903071. The reversal of 189950903064 is 460309059981.

189950903064 is a `hidden beast` number, since 18 + 99 + 509 + 0 + 30 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 189950903064.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189950903063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18159724 + ... + 18170180.

Almost surely, 2^189950903064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189950903064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284185692000).

189950903064 is an abundant number, since it is smaller than the sum of its proper divisors (378420480936).

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

189950903064 is a wasteful number, since it uses less digits than its factorization.

189950903064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16954 (or 16944 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 189950903064 in words is "one hundred eighty-nine billion, nine hundred fifty million, nine hundred three thousand, sixty-four".