64551 has 4 divisors (see below), whose sum is σ = 86072. Its totient is φ = 43032.

The previous prime is 64513. The next prime is 64553. The reversal of 64551 is 15546.

It is a happy number.

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

It is not a de Polignac number, because 64551 - 2¹⁰ = 63527 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 64551.

It is not an unprimeable number, because it can be changed into a prime (64553) 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, 10756 + ... + 10761.

It is an arithmetic number, because the mean of its divisors is an integer number (21518).

2⁶⁴⁵⁵¹ is an apocalyptic number.

64551 is a deficient number, since it is larger than the sum of its proper divisors (21521).

64551 is a wasteful number, since it uses less digits than its factorization.

64551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21520.

The product of its digits is 600, while the sum is 21.

The square root of 64551 is about 254.0688882961. The cubic root of 64551 is about 40.1144638052.

It can be divided in two parts, 645 and 51, that added together give a palindrome (696).

The spelling of 64551 in words is "sixty-four thousand, five hundred fifty-one".