16640773665 has 16 divisors (see below), whose sum is σ = 26924400000. Its totient is φ = 8775358592.

The previous prime is 16640773657. The next prime is 16640773687. The reversal of 16640773665 is 56637704661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16640773665 - 2³ = 16640773657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6231165 + ... + 6233834.

It is an arithmetic number, because the mean of its divisors is an integer number (1682775000).

Almost surely, 2^16640773665 is an apocalyptic number.

16640773665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16640773665 is a deficient number, since it is larger than the sum of its proper divisors (10283626335).

16640773665 is a wasteful number, since it uses less digits than its factorization.

16640773665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12465096.

The product of its (nonzero) digits is 3810240, while the sum is 51.

The spelling of 16640773665 in words is "sixteen billion, six hundred forty million, seven hundred seventy-three thousand, six hundred sixty-five".