64651 has 4 divisors (see below), whose sum is σ = 68472. Its totient is φ = 60832.

The previous prime is 64633. The next prime is 64661. The reversal of 64651 is 15646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15646 = 2 ⋅7823.

It is a cyclic number.

It is not a de Polignac number, because 64651 - 2¹¹ = 62603 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64601) 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, 1885 + ... + 1918.

It is an arithmetic number, because the mean of its divisors is an integer number (17118).

2⁶⁴⁶⁵¹ is an apocalyptic number.

64651 is a deficient number, since it is larger than the sum of its proper divisors (3821).

64651 is a wasteful number, since it uses less digits than its factorization.

64651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3820.

The product of its digits is 720, while the sum is 22.

The square root of 64651 is about 254.2656091570. The cubic root of 64651 is about 40.1351677276.

The spelling of 64651 in words is "sixty-four thousand, six hundred fifty-one".