191977226736 has 20 divisors (see below), whose sum is σ = 495941169192. Its totient is φ = 63992408896.

The previous prime is 191977226717. The next prime is 191977226783. The reversal of 191977226736 is 637622779191.

It is a self number, because there is not a number n which added to its sum of digits gives 191977226736.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 1999762731 + ... + 1999762826.

Almost surely, 2^191977226736 is an apocalyptic number.

191977226736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

191977226736 is an abundant number, since it is smaller than the sum of its proper divisors (303963942456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191977226736 is a wasteful number, since it uses less digits than its factorization.

191977226736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3999525568 (or 3999525562 counting only the distinct ones).

The product of its digits is 12002256, while the sum is 60.

The spelling of 191977226736 in words is "one hundred ninety-one billion, nine hundred seventy-seven million, two hundred twenty-six thousand, seven hundred thirty-six".