2016449666545 has 4 divisors (see below), whose sum is σ = 2419739599860. Its totient is φ = 1613159733232.

The previous prime is 2016449666533. The next prime is 2016449666593. The reversal of 2016449666545 is 5456669446102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 718853013904 + 1297596652641 = 847852^2 + 1139121^2 .

It is a cyclic number.

It is not a de Polignac number, because 2016449666545 - 2¹⁵ = 2016449633777 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2016449666545.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201644966650 + ... + 201644966659.

It is an arithmetic number, because the mean of its divisors is an integer number (604934899965).

Almost surely, 2^{2016449666545} is an apocalyptic number.

It is an amenable number.

2016449666545 is a deficient number, since it is larger than the sum of its proper divisors (403289933315).

2016449666545 is an equidigital number, since it uses as much as digits as its factorization.

2016449666545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403289933314.

The product of its (nonzero) digits is 37324800, while the sum is 58.

The spelling of 2016449666545 in words is "two trillion, sixteen billion, four hundred forty-nine million, six hundred sixty-six thousand, five hundred forty-five".