201640644466 has 32 divisors (see below), whose sum is σ = 325179422208. Its totient is φ = 93549603840.

The previous prime is 201640644463. The next prime is 201640644479. The reversal of 201640644466 is 664446046102.

It is not an unprimeable number, because it can be changed into a prime (201640644463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168375 + ... + 656986.

It is an arithmetic number, because the mean of its divisors is an integer number (10161856944).

Almost surely, 2^201640644466 is an apocalyptic number.

201640644466 is a deficient number, since it is larger than the sum of its proper divisors (123538777742).

201640644466 is a wasteful number, since it uses less digits than its factorization.

201640644466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825546.

The product of its (nonzero) digits is 663552, while the sum is 43.

The spelling of 201640644466 in words is "two hundred one billion, six hundred forty million, six hundred forty-four thousand, four hundred sixty-six".