64340045645 has 4 divisors (see below), whose sum is σ = 77208054780. Its totient is φ = 51472036512.

The previous prime is 64340045599. The next prime is 64340045657. The reversal of 64340045645 is 54654004346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54654004346 = 2 ⋅27327002173.

It can be written as a sum of positive squares in 2 ways, for example, as 35862133129 + 28477912516 = 189373^2 + 168754^2 .

It is a cyclic number.

It is not a de Polignac number, because 64340045645 - 2¹⁴ = 64340029261 is a prime.

It is a super-3 number, since 3×64340045645³ (a number of 33 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent 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, 6434004560 + ... + 6434004569.

It is an arithmetic number, because the mean of its divisors is an integer number (19302013695).

Almost surely, 2^64340045645 is an apocalyptic number.

It is an amenable number.

64340045645 is a deficient number, since it is larger than the sum of its proper divisors (12868009135).

64340045645 is a wasteful number, since it uses less digits than its factorization.

64340045645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12868009134.

The product of its (nonzero) digits is 691200, while the sum is 41.

The spelling of 64340045645 in words is "sixty-four billion, three hundred forty million, forty-five thousand, six hundred forty-five".