6366663440 has 60 divisors (see below), whose sum is σ = 15295580172. Its totient is φ = 2464485120.

The previous prime is 6366663439. The next prime is 6366663461. The reversal of 6366663440 is 443666636.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3483832576 + 2882830864 = 59024^2 + 53692^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6366663391 and 6366663400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35474 + ... + 118286.

Almost surely, 2^6366663440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6366663440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7647790086).

6366663440 is an abundant number, since it is smaller than the sum of its proper divisors (8928916732).

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

6366663440 is a wasteful number, since it uses less digits than its factorization.

6366663440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82888 (or 82851 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 44.

The square root of 6366663440 is about 79791.3744711795. The cubic root of 6366663440 is about 1853.4062824601.

The spelling of 6366663440 in words is "six billion, three hundred sixty-six million, six hundred sixty-three thousand, four hundred forty".