16485666640 has 20 divisors (see below), whose sum is σ = 38329175124. Its totient is φ = 6594266624.

The previous prime is 16485666623. The next prime is 16485666647. The reversal of 16485666640 is 4666658461.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11664864016 + 4820802624 = 108004^2 + 69432^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16485666647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103035337 + ... + 103035496.

Almost surely, 2^16485666640 is an apocalyptic number.

16485666640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16485666640 is an abundant number, since it is smaller than the sum of its proper divisors (21843508484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16485666640 is a wasteful number, since it uses less digits than its factorization.

16485666640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206070846 (or 206070840 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 16485666640 in words is "sixteen billion, four hundred eighty-five million, six hundred sixty-six thousand, six hundred forty".