640664466046 has 16 divisors (see below), whose sum is σ = 1048424446080. Its totient is φ = 291193229080.

The previous prime is 640664466007. The next prime is 640664466077.

It is a happy number.

640664466046 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 640664465984 and 640664466002.

It is a congruent number.

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, 524986 + ... + 1247773.

It is an arithmetic number, because the mean of its divisors is an integer number (65526527880).

Almost surely, 2^640664466046 is an apocalyptic number.

640664466046 is a deficient number, since it is larger than the sum of its proper divisors (407759980034).

640664466046 is a wasteful number, since it uses less digits than its factorization.

640664466046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789199.

The product of its (nonzero) digits is 11943936, while the sum is 52.

The spelling of 640664466046 in words is "six hundred forty billion, six hundred sixty-four million, four hundred sixty-six thousand, forty-six".