189450858649 has 8 divisors (see below), whose sum is σ = 209538164360. Its totient is φ = 170151290496.

The previous prime is 189450858647. The next prime is 189450858661. The reversal of 189450858649 is 946858054981.

It can be written as a sum of positive squares in 4 ways, for example, as 19733225625 + 169717633024 = 140475^2 + 411968^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189450858649 - 2¹ = 189450858647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189450858643) 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, 196933884 + ... + 196934845.

It is an arithmetic number, because the mean of its divisors is an integer number (26192270545).

Almost surely, 2^189450858649 is an apocalyptic number.

It is an amenable number.

189450858649 is a deficient number, since it is larger than the sum of its proper divisors (20087305711).

189450858649 is a wasteful number, since it uses less digits than its factorization.

189450858649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393868779.

The product of its (nonzero) digits is 99532800, while the sum is 67.

The spelling of 189450858649 in words is "one hundred eighty-nine billion, four hundred fifty million, eight hundred fifty-eight thousand, six hundred forty-nine".