64771724561 has 8 divisors (see below), whose sum is σ = 64927100160. Its totient is φ = 64616421168.

The previous prime is 64771724557. The next prime is 64771724569. The reversal of 64771724561 is 16542717746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64771724561 - 2² = 64771724557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64771724569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2061155 + ... + 2092343.

It is an arithmetic number, because the mean of its divisors is an integer number (8115887520).

Almost surely, 2^64771724561 is an apocalyptic number.

It is an amenable number.

64771724561 is a deficient number, since it is larger than the sum of its proper divisors (155375599).

64771724561 is a wasteful number, since it uses less digits than its factorization.

64771724561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36103.

The product of its digits is 1975680, while the sum is 50.

The spelling of 64771724561 in words is "sixty-four billion, seven hundred seventy-one million, seven hundred twenty-four thousand, five hundred sixty-one".