66644664468 has 12 divisors (see below), whose sum is σ = 155504217120. Its totient is φ = 22214888152.

The previous prime is 66644664467. The next prime is 66644664469. The reversal of 66644664468 is 86446644666.

It is an interprime number because it is at equal distance from previous prime (66644664467) and next prime (66644664469).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×66644664468² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66644664467) 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, 2776861008 + ... + 2776861031.

It is an arithmetic number, because the mean of its divisors is an integer number (12958684760).

Almost surely, 2^66644664468 is an apocalyptic number.

It is an amenable number.

66644664468 is an abundant number, since it is smaller than the sum of its proper divisors (88859552652).

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

66644664468 is a wasteful number, since it uses less digits than its factorization.

66644664468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5553722046 (or 5553722044 counting only the distinct ones).

The product of its digits is 95551488, while the sum is 60.

The spelling of 66644664468 in words is "sixty-six billion, six hundred forty-four million, six hundred sixty-four thousand, four hundred sixty-eight".