189661992004 has 81 divisors (see below), whose sum is σ = 350696864791. Its totient is φ = 89748252160.

The previous prime is 189661991983. The next prime is 189661992031. The reversal of 189661992004 is 400299166981.

The square root of 189661992004 is 435502.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 166815064900 + 22846927104 = 408430^2 + 151152^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1678424652 + ... + 1678424764.

Almost surely, 2^189661992004 is an apocalyptic number.

189661992004 is the 435502-nd square number.

It is an amenable number.

189661992004 is a deficient number, since it is larger than the sum of its proper divisors (161034872787).

189661992004 is an equidigital number, since it uses as much as digits as its factorization.

189661992004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 189661992004 in words is "one hundred eighty-nine billion, six hundred sixty-one million, nine hundred ninety-two thousand, four".