189180809872 has 20 divisors (see below), whose sum is σ = 372546637756. Its totient is φ = 93039742080.

The previous prime is 189180809863. The next prime is 189180809893. The reversal of 189180809872 is 278908081981.

It can be written as a sum of positive squares in 2 ways, for example, as 10840141456 + 178340668416 = 104116^2 + 422304^2 .

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a self number, because there is not a number n which added to its sum of digits gives 189180809872.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96915423 + ... + 96917374.

Almost surely, 2^189180809872 is an apocalyptic number.

It is an amenable number.

189180809872 is a deficient number, since it is larger than the sum of its proper divisors (183365827884).

189180809872 is a wasteful number, since it uses less digits than its factorization.

189180809872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193832866 (or 193832860 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 61.

The spelling of 189180809872 in words is "one hundred eighty-nine billion, one hundred eighty million, eight hundred nine thousand, eight hundred seventy-two".