66446909963 has 12 divisors (see below), whose sum is σ = 77370270120. Its totient is φ = 56899315872.

The previous prime is 66446909959. The next prime is 66446909983. The reversal of 66446909963 is 36990964466.

66446909963 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66446909963 - 2² = 66446909959 is a prime.

It is a super-2 number, since 2×66446909963² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66446909896 and 66446909905.

It is not an unprimeable number, because it can be changed into a prime (66446909983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 605753 + ... + 706986.

It is an arithmetic number, because the mean of its divisors is an integer number (6447522510).

Almost surely, 2^66446909963 is an apocalyptic number.

66446909963 is a deficient number, since it is larger than the sum of its proper divisors (10923360157).

66446909963 is a wasteful number, since it uses less digits than its factorization.

66446909963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313786 (or 1313779 counting only the distinct ones).

The product of its (nonzero) digits is 45349632, while the sum is 62.

The spelling of 66446909963 in words is "sixty-six billion, four hundred forty-six million, nine hundred nine thousand, nine hundred sixty-three".