6640146636 has 24 divisors (see below), whose sum is σ = 15871571184. Its totient is φ = 2159397120.

The previous prime is 6640146607. The next prime is 6640146641. The reversal of 6640146636 is 6366410466.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6747625 + ... + 6748608.

It is an arithmetic number, because the mean of its divisors is an integer number (661315466).

Almost surely, 2^6640146636 is an apocalyptic number.

It is an amenable number.

6640146636 is an abundant number, since it is smaller than the sum of its proper divisors (9231424548).

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

6640146636 is a wasteful number, since it uses less digits than its factorization.

6640146636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13496281 (or 13496279 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 42.

The square root of 6640146636 is about 81487.0949046535. The cubic root of 6640146636 is about 1879.5731107850.

The spelling of 6640146636 in words is "six billion, six hundred forty million, one hundred forty-six thousand, six hundred thirty-six".