191064648481 has 4 divisors (see below), whose sum is σ = 218359598272. Its totient is φ = 163769698692.

The previous prime is 191064648443. The next prime is 191064648487. The reversal of 191064648481 is 184846460191.

191064648481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191064648481 - 2²⁵ = 191031094049 is a prime.

It is a super-2 number, since 2×191064648481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191064648487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13647474885 + ... + 13647474898.

It is an arithmetic number, because the mean of its divisors is an integer number (54589899568).

Almost surely, 2^191064648481 is an apocalyptic number.

It is an amenable number.

191064648481 is a deficient number, since it is larger than the sum of its proper divisors (27294949791).

191064648481 is an equidigital number, since it uses as much as digits as its factorization.

191064648481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27294949790.

The product of its (nonzero) digits is 1327104, while the sum is 52.

The spelling of 191064648481 in words is "one hundred ninety-one billion, sixty-four million, six hundred forty-eight thousand, four hundred eighty-one".