189157019493 has 32 divisors (see below), whose sum is σ = 273617245440. Its totient is φ = 115547281920.

The previous prime is 189157019459. The next prime is 189157019501. The reversal of 189157019493 is 394910751981.

It is a happy number.

It is not a de Polignac number, because 189157019493 - 2²⁰ = 189155970917 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189157019423) 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 31 ways as a sum of consecutive naturals, for example, 2849403 + ... + 2915031.

It is an arithmetic number, because the mean of its divisors is an integer number (8550538920).

Almost surely, 2^189157019493 is an apocalyptic number.

189157019493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

189157019493 is a deficient number, since it is larger than the sum of its proper divisors (84460225947).

189157019493 is a wasteful number, since it uses less digits than its factorization.

189157019493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66189.

The product of its (nonzero) digits is 2449440, while the sum is 57.

The spelling of 189157019493 in words is "one hundred eighty-nine billion, one hundred fifty-seven million, nineteen thousand, four hundred ninety-three".