189907999979 has 2 divisors, whose sum is σ = 189907999980. Its totient is φ = 189907999978.

The previous prime is 189907999951. The next prime is 189908000011. The reversal of 189907999979 is 979999709981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189907999979 - 2¹⁶ = 189907934443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189907999979.

It is not a weakly prime, because it can be changed into another prime (189907999079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94953999989 + 94953999990.

It is an arithmetic number, because the mean of its divisors is an integer number (94953999990).

Almost surely, 2^189907999979 is an apocalyptic number.

189907999979 is a deficient number, since it is larger than the sum of its proper divisors (1).

189907999979 is an equidigital number, since it uses as much as digits as its factorization.

189907999979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1874923848, while the sum is 86.

The spelling of 189907999979 in words is "one hundred eighty-nine billion, nine hundred seven million, nine hundred ninety-nine thousand, nine hundred seventy-nine".