64768709191 has 4 divisors (see below), whose sum is σ = 64790749800. Its totient is φ = 64746668584.

The previous prime is 64768709183. The next prime is 64768709219. The reversal of 64768709191 is 19190786746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64768709191 - 2³ = 64768709183 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64768709101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11015896 + ... + 11021773.

It is an arithmetic number, because the mean of its divisors is an integer number (16197687450).

Almost surely, 2^64768709191 is an apocalyptic number.

64768709191 is a deficient number, since it is larger than the sum of its proper divisors (22040609).

64768709191 is a wasteful number, since it uses less digits than its factorization.

64768709191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22040608.

The product of its (nonzero) digits is 4572288, while the sum is 58.

The spelling of 64768709191 in words is "sixty-four billion, seven hundred sixty-eight million, seven hundred nine thousand, one hundred ninety-one".