64224661 has 4 divisors (see below), whose sum is σ = 64263052. Its totient is φ = 64186272.

The previous prime is 64224631. The next prime is 64224689. The reversal of 64224661 is 16642246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16642246 = 2 ⋅8321123.

It can be written as a sum of positive squares in 2 ways, for example, as 9922500 + 54302161 = 3150^2 + 7369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64224661 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 (64224631) 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, 16566 + ... + 20071.

It is an arithmetic number, because the mean of its divisors is an integer number (16065763).

Almost surely, 2^64224661 is an apocalyptic number.

It is an amenable number.

64224661 is a deficient number, since it is larger than the sum of its proper divisors (38391).

64224661 is a wasteful number, since it uses less digits than its factorization.

64224661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38390.

The product of its digits is 13824, while the sum is 31.

The square root of 64224661 is about 8014.0290116770. The cubic root of 64224661 is about 400.4674971532.

The spelling of 64224661 in words is "sixty-four million, two hundred twenty-four thousand, six hundred sixty-one".