189468642019 has 4 divisors (see below), whose sum is σ = 189469512720. Its totient is φ = 189467771320.

The previous prime is 189468642007. The next prime is 189468642023. The reversal of 189468642019 is 910246864981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 910246864981 = 131 ⋅6948449351.

It is a cyclic number.

It is not a de Polignac number, because 189468642019 - 2⁹ = 189468641507 is a prime.

It is a super-2 number, since 2×189468642019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189468642119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205962 + ... + 649120.

It is an arithmetic number, because the mean of its divisors is an integer number (47367378180).

Almost surely, 2^189468642019 is an apocalyptic number.

189468642019 is a deficient number, since it is larger than the sum of its proper divisors (870701).

189468642019 is an equidigital number, since it uses as much as digits as its factorization.

189468642019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870700.

The product of its (nonzero) digits is 5971968, while the sum is 58.

The spelling of 189468642019 in words is "one hundred eighty-nine billion, four hundred sixty-eight million, six hundred forty-two thousand, nineteen".