189806693891 has 8 divisors (see below), whose sum is σ = 190020629904. Its totient is φ = 189592858080.

The previous prime is 189806693833. The next prime is 189806693893. The reversal of 189806693891 is 198396608981.

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 189806693891 - 2¹⁴ = 189806677507 is a prime.

It is a super-3 number, since 3×189806693891³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189806693893) 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, 4149656 + ... + 4195146.

It is an arithmetic number, because the mean of its divisors is an integer number (23752578738).

Almost surely, 2^189806693891 is an apocalyptic number.

189806693891 is a deficient number, since it is larger than the sum of its proper divisors (213936013).

189806693891 is a wasteful number, since it uses less digits than its factorization.

189806693891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50101.

The product of its (nonzero) digits is 40310784, while the sum is 68.

The spelling of 189806693891 in words is "one hundred eighty-nine billion, eight hundred six million, six hundred ninety-three thousand, eight hundred ninety-one".