6640461345 has 16 divisors (see below), whose sum is σ = 12142558080. Its totient is φ = 3035639424.

The previous prime is 6640461329. The next prime is 6640461371. The reversal of 6640461345 is 5431640466.

It is not a de Polignac number, because 6640461345 - 2⁴ = 6640461329 is a prime.

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, 31621140 + ... + 31621349.

It is an arithmetic number, because the mean of its divisors is an integer number (758909880).

Almost surely, 2^6640461345 is an apocalyptic number.

It is an amenable number.

6640461345 is a deficient number, since it is larger than the sum of its proper divisors (5502096735).

6640461345 is a wasteful number, since it uses less digits than its factorization.

6640461345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63242504.

The product of its (nonzero) digits is 207360, while the sum is 39.

The square root of 6640461345 is about 81489.0259176044. The cubic root of 6640461345 is about 1879.6028043677.

The spelling of 6640461345 in words is "six billion, six hundred forty million, four hundred sixty-one thousand, three hundred forty-five".