64550523553 has 4 divisors (see below), whose sum is σ = 65058795520. Its totient is φ = 64042251588.

The previous prime is 64550523551. The next prime is 64550523577. The reversal of 64550523553 is 35532505546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64550523553 - 2¹ = 64550523551 is a prime.

It is a super-3 number, since 3×64550523553³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64550523551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254135793 + ... + 254136046.

It is an arithmetic number, because the mean of its divisors is an integer number (16264698880).

Almost surely, 2^64550523553 is an apocalyptic number.

It is an amenable number.

64550523553 is a deficient number, since it is larger than the sum of its proper divisors (508271967).

64550523553 is a wasteful number, since it uses less digits than its factorization.

64550523553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508271966.

The product of its (nonzero) digits is 1350000, while the sum is 43.

The spelling of 64550523553 in words is "sixty-four billion, five hundred fifty million, five hundred twenty-three thousand, five hundred fifty-three".