190668971816 has 8 divisors (see below), whose sum is σ = 357504322170. Its totient is φ = 95334485904.

The previous prime is 190668971809. The next prime is 190668971827. The reversal of 190668971816 is 618179866091.

It can be written as a sum of positive squares in only one way, i.e., 176529383716 + 14139588100 = 420154^2 + 118910^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 11916810731 + ... + 11916810746.

Almost surely, 2^190668971816 is an apocalyptic number.

It is an amenable number.

190668971816 is a deficient number, since it is larger than the sum of its proper divisors (166835350354).

190668971816 is a wasteful number, since it uses less digits than its factorization.

190668971816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23833621483 (or 23833621479 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 62.

The spelling of 190668971816 in words is "one hundred ninety billion, six hundred sixty-eight million, nine hundred seventy-one thousand, eight hundred sixteen".