189873664090 has 32 divisors (see below), whose sum is σ = 373382550720. Its totient is φ = 68945020800.

The previous prime is 189873664069. The next prime is 189873664091. The reversal of 189873664090 is 90466378981.

It is not an unprimeable number, because it can be changed into a prime (189873664091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1172995 + ... + 1325014.

It is an arithmetic number, because the mean of its divisors is an integer number (11668204710).

Almost surely, 2^189873664090 is an apocalyptic number.

189873664090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189873664090 is a deficient number, since it is larger than the sum of its proper divisors (183508886630).

189873664090 is a wasteful number, since it uses less digits than its factorization.

189873664090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2498718.

The product of its (nonzero) digits is 15676416, while the sum is 61.

The spelling of 189873664090 in words is "one hundred eighty-nine billion, eight hundred seventy-three million, six hundred sixty-four thousand, ninety".