64688274691 has 4 divisors (see below), whose sum is σ = 64701209592. Its totient is φ = 64675339792.

The previous prime is 64688274641. The next prime is 64688274701. The reversal of 64688274691 is 19647288646.

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 64688274691 - 2¹¹ = 64688272643 is a prime.

It is a super-2 number, since 2×64688274691² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64688274641) 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, 6459946 + ... + 6469951.

It is an arithmetic number, because the mean of its divisors is an integer number (16175302398).

Almost surely, 2^64688274691 is an apocalyptic number.

64688274691 is a deficient number, since it is larger than the sum of its proper divisors (12934901).

64688274691 is a wasteful number, since it uses less digits than its factorization.

64688274691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12934900.

The product of its digits is 27869184, while the sum is 61.

The spelling of 64688274691 in words is "sixty-four billion, six hundred eighty-eight million, two hundred seventy-four thousand, six hundred ninety-one".