191390667388 has 6 divisors (see below), whose sum is σ = 334933667936. Its totient is φ = 95695333692.

The previous prime is 191390667359. The next prime is 191390667421. The reversal of 191390667388 is 883766093191.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23923833420 + ... + 23923833427.

Almost surely, 2^191390667388 is an apocalyptic number.

It is an amenable number.

191390667388 is a deficient number, since it is larger than the sum of its proper divisors (143543000548).

191390667388 is a wasteful number, since it uses less digits than its factorization.

191390667388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47847666851 (or 47847666849 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 61.

The spelling of 191390667388 in words is "one hundred ninety-one billion, three hundred ninety million, six hundred sixty-seven thousand, three hundred eighty-eight".