6440705263670 has 32 divisors (see below), whose sum is σ = 12430609142400. Its totient is φ = 2394043232256.

The previous prime is 6440705263661. The next prime is 6440705263723. The reversal of 6440705263670 is 763625070446.

It is a Curzon number.

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, 239774555 + ... + 239801414.

It is an arithmetic number, because the mean of its divisors is an integer number (388456535700).

Almost surely, 2^{6440705263670} is an apocalyptic number.

6440705263670 is a deficient number, since it is larger than the sum of its proper divisors (5989903878730).

6440705263670 is a wasteful number, since it uses less digits than its factorization.

6440705263670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479576072.

The product of its (nonzero) digits is 5080320, while the sum is 50.

The spelling of 6440705263670 in words is "six trillion, four hundred forty billion, seven hundred five million, two hundred sixty-three thousand, six hundred seventy".