190409719779 has 6 divisors (see below), whose sum is σ = 275036261916. Its totient is φ = 126939813180.

The previous prime is 190409719777. The next prime is 190409719793. The reversal of 190409719779 is 977917904091.

190409719779 is a `hidden beast` number, since 1 + 9 + 0 + 409 + 71 + 97 + 79 = 666.

It is not a de Polignac number, because 190409719779 - 2¹ = 190409719777 is a prime.

It is a super-2 number, since 2×190409719779² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (190409719771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10578317757 + ... + 10578317774.

It is an arithmetic number, because the mean of its divisors is an integer number (45839376986).

Almost surely, 2^190409719779 is an apocalyptic number.

190409719779 is a deficient number, since it is larger than the sum of its proper divisors (84626542137).

190409719779 is a wasteful number, since it uses less digits than its factorization.

190409719779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21156635537 (or 21156635534 counting only the distinct ones).

The product of its (nonzero) digits is 9001692, while the sum is 63.

The spelling of 190409719779 in words is "one hundred ninety billion, four hundred nine million, seven hundred nineteen thousand, seven hundred seventy-nine".