64591066745 has 8 divisors (see below), whose sum is σ = 77578677384. Its totient is φ = 51626588544.

The previous prime is 64591066741. The next prime is 64591066753. The reversal of 64591066745 is 54766019546.

It can be written as a sum of positive squares in 4 ways, for example, as 6183777769 + 58407288976 = 78637^2 + 241676^2 .

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 64591066745 - 2² = 64591066741 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64591066741) 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, 5776964 + ... + 5788133.

It is an arithmetic number, because the mean of its divisors is an integer number (9697334673).

Almost surely, 2^64591066745 is an apocalyptic number.

It is an amenable number.

64591066745 is a deficient number, since it is larger than the sum of its proper divisors (12987610639).

64591066745 is a wasteful number, since it uses less digits than its factorization.

64591066745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11566219.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 64591066745 in words is "sixty-four billion, five hundred ninety-one million, sixty-six thousand, seven hundred forty-five".