64681336011 has 4 divisors (see below), whose sum is σ = 86241781352. Its totient is φ = 43120890672.

The previous prime is 64681335997. The next prime is 64681336019. The reversal of 64681336011 is 11063318646.

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

It is not a de Polignac number, because 64681336011 - 2¹¹ = 64681333963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64681336019) 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, 10780222666 + ... + 10780222671.

It is an arithmetic number, because the mean of its divisors is an integer number (21560445338).

Almost surely, 2^64681336011 is an apocalyptic number.

64681336011 is a deficient number, since it is larger than the sum of its proper divisors (21560445341).

64681336011 is a wasteful number, since it uses less digits than its factorization.

64681336011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21560445340.

The product of its (nonzero) digits is 62208, while the sum is 39.

The spelling of 64681336011 in words is "sixty-four billion, six hundred eighty-one million, three hundred thirty-six thousand, eleven".