16645356651 has 48 divisors (see below), whose sum is σ = 28352620800. Its totient is φ = 8500303680.

The previous prime is 16645356593. The next prime is 16645356661. The reversal of 16645356651 is 15665354661.

It is not a de Polignac number, because 16645356651 - 2¹⁴ = 16645340267 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16645356651.

It is not an unprimeable number, because it can be changed into a prime (16645356661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 94405 + ... + 205433.

It is an arithmetic number, because the mean of its divisors is an integer number (590679600).

Almost surely, 2^16645356651 is an apocalyptic number.

16645356651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16645356651 is a deficient number, since it is larger than the sum of its proper divisors (11707264149).

16645356651 is a wasteful number, since it uses less digits than its factorization.

16645356651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111120 (or 111109 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 48.

The spelling of 16645356651 in words is "sixteen billion, six hundred forty-five million, three hundred fifty-six thousand, six hundred fifty-one".