64505533663 has 4 divisors (see below), whose sum is σ = 66729862440. Its totient is φ = 62281204888.

The previous prime is 64505533657. The next prime is 64505533717. The reversal of 64505533663 is 36633550546.

It is a happy number.

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 64505533663 - 2¹³ = 64505525471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64505533643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1112164345 + ... + 1112164402.

It is an arithmetic number, because the mean of its divisors is an integer number (16682465610).

Almost surely, 2^64505533663 is an apocalyptic number.

64505533663 is a deficient number, since it is larger than the sum of its proper divisors (2224328777).

64505533663 is a wasteful number, since it uses less digits than its factorization.

64505533663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224328776.

The product of its (nonzero) digits is 2916000, while the sum is 46.

The spelling of 64505533663 in words is "sixty-four billion, five hundred five million, five hundred thirty-three thousand, six hundred sixty-three".