6400066716 has 48 divisors (see below), whose sum is σ = 16611078400. Its totient is φ = 2131001136.

The previous prime is 6400066703. The next prime is 6400066763. The reversal of 6400066716 is 6176600046.

6400066716 is a `hidden beast` number, since 640 + 0 + 0 + 6 + 6 + 7 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67011 + ... + 131493.

Almost surely, 2^6400066716 is an apocalyptic number.

It is an amenable number.

6400066716 is an abundant number, since it is smaller than the sum of its proper divisors (10211011684).

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

6400066716 is a wasteful number, since it uses less digits than its factorization.

6400066716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65415 (or 65407 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 6400066716 is about 80000.4169739133. The cubic root of 6400066716 is about 1856.6419848444.

The spelling of 6400066716 in words is "six billion, four hundred million, sixty-six thousand, seven hundred sixteen".