6406663662 has 144 divisors (see below), whose sum is σ = 16920053280. Its totient is φ = 1743565824.

The previous prime is 6406663651. The next prime is 6406663667. The reversal of 6406663662 is 2663666046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6406663667) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6349014 + ... + 6350022.

It is an arithmetic number, because the mean of its divisors is an integer number (117500370).

Almost surely, 2^6406663662 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6406663662, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8460026640).

6406663662 is an abundant number, since it is smaller than the sum of its proper divisors (10513389618).

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

6406663662 is a wasteful number, since it uses less digits than its factorization.

6406663662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367 (or 1357 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 45.

The square root of 6406663662 is about 80041.6370522243. The cubic root of 6406663662 is about 1857.2796844993.

The spelling of 6406663662 in words is "six billion, four hundred six million, six hundred sixty-three thousand, six hundred sixty-two".