64543651 has 4 divisors (see below), whose sum is σ = 66288112. Its totient is φ = 62799192.

The previous prime is 64543649. The next prime is 64543657. The reversal of 64543651 is 15634546.

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 64543651 - 2¹ = 64543649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64543657) 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, 872175 + ... + 872248.

It is an arithmetic number, because the mean of its divisors is an integer number (16572028).

Almost surely, 2^64543651 is an apocalyptic number.

64543651 is a deficient number, since it is larger than the sum of its proper divisors (1744461).

64543651 is a wasteful number, since it uses less digits than its factorization.

64543651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744460.

The product of its digits is 43200, while the sum is 34.

The square root of 64543651 is about 8033.9063350278. The cubic root of 64543651 is about 401.1294143069.

The spelling of 64543651 in words is "sixty-four million, five hundred forty-three thousand, six hundred fifty-one".