16506444613665 has 16 divisors (see below), whose sum is σ = 26652607819200. Its totient is φ = 8722671648192.

The previous prime is 16506444613661. The next prime is 16506444613679. The reversal of 16506444613665 is 56631644460561.

It is not a de Polignac number, because 16506444613665 - 2² = 16506444613661 is a prime.

It is a super-2 number, since 2×16506444613665² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16506444613661) 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, 5047840755 + ... + 5047844024.

It is an arithmetic number, because the mean of its divisors is an integer number (1665787988700).

Almost surely, 2^{16506444613665} is an apocalyptic number.

16506444613665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16506444613665 is a deficient number, since it is larger than the sum of its proper divisors (10146163205535).

16506444613665 is a wasteful number, since it uses less digits than its factorization.

16506444613665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10095684896.

The product of its (nonzero) digits is 37324800, while the sum is 57.

The spelling of 16506444613665 in words is "sixteen trillion, five hundred six billion, four hundred forty-four million, six hundred thirteen thousand, six hundred sixty-five".