64666222240 has 48 divisors (see below), whose sum is σ = 159416304768. Its totient is φ = 24741857536.

The previous prime is 64666222223. The next prime is 64666222241. The reversal of 64666222240 is 4222266646.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 64666222193 and 64666222202.

It is not an unprimeable number, because it can be changed into a prime (64666222241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8782492 + ... + 8789851.

It is an arithmetic number, because the mean of its divisors is an integer number (3321173016).

Almost surely, 2^64666222240 is an apocalyptic number.

It is an amenable number.

64666222240 is an abundant number, since it is smaller than the sum of its proper divisors (94750082528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64666222240 is a wasteful number, since it uses less digits than its factorization.

64666222240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17572381 (or 17572373 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

Adding to 64666222240 its reverse (4222266646), we get a palindrome (68888488886).

The spelling of 64666222240 in words is "sixty-four billion, six hundred sixty-six million, two hundred twenty-two thousand, two hundred forty".