6640870780466 has 64 divisors (see below), whose sum is σ = 11307012242400. Its totient is φ = 2903688345600.

The previous prime is 6640870780399. The next prime is 6640870780469.

6640870780466 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 16 ways, for example, as 79696113025 + 6561174667441 = 282305^2 + 2561479^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6640870780399 and 6640870780408.

It is not an unprimeable number, because it can be changed into a prime (6640870780469) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18635036 + ... + 18988056.

Almost surely, 2^{6640870780466} is an apocalyptic number.

6640870780466 is a deficient number, since it is larger than the sum of its proper divisors (4666141461934).

6640870780466 is a wasteful number, since it uses less digits than its factorization.

6640870780466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353535.

The product of its (nonzero) digits is 65028096, while the sum is 62.

The spelling of 6640870780466 in words is "six trillion, six hundred forty billion, eight hundred seventy million, seven hundred eighty thousand, four hundred sixty-six".