16645540516 has 24 divisors (see below), whose sum is σ = 31784024160. Its totient is φ = 7564684800.

The previous prime is 16645540511. The next prime is 16645540537. The reversal of 16645540516 is 61504554661.

It is not an unprimeable number, because it can be changed into a prime (16645540511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211071 + ... + 279001.

It is an arithmetic number, because the mean of its divisors is an integer number (1324334340).

Almost surely, 2^16645540516 is an apocalyptic number.

It is an amenable number.

16645540516 is a deficient number, since it is larger than the sum of its proper divisors (15138483644).

16645540516 is a wasteful number, since it uses less digits than its factorization.

16645540516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73515 (or 73513 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 16645540516 in words is "sixteen billion, six hundred forty-five million, five hundred forty thousand, five hundred sixteen".