64541501065 has 4 divisors (see below), whose sum is σ = 77449801284. Its totient is φ = 51633200848.

The previous prime is 64541501053. The next prime is 64541501107. The reversal of 64541501065 is 56010514546.

64541501065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44685309321 + 19856191744 = 211389^2 + 140912^2 .

It is a cyclic number.

It is not a de Polignac number, because 64541501065 - 2¹¹ = 64541499017 is a prime.

It is a super-2 number, since 2×64541501065² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6454150102 + ... + 6454150111.

It is an arithmetic number, because the mean of its divisors is an integer number (19362450321).

Almost surely, 2^64541501065 is an apocalyptic number.

It is an amenable number.

64541501065 is a deficient number, since it is larger than the sum of its proper divisors (12908300219).

64541501065 is a wasteful number, since it uses less digits than its factorization.

64541501065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12908300218.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 64541501065 in words is "sixty-four billion, five hundred forty-one million, five hundred one thousand, sixty-five".