1616315660545 has 4 divisors (see below), whose sum is σ = 1939578792660. Its totient is φ = 1293052528432.

The previous prime is 1616315660543. The next prime is 1616315660563. The reversal of 1616315660545 is 5450665136161.

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 607889986929 + 1008425673616 = 779673^2 + 1004204^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616315660545 - 2¹ = 1616315660543 is a prime.

It is a super-2 number, since 2×1616315660545² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1616315660543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161631566050 + ... + 161631566059.

It is an arithmetic number, because the mean of its divisors is an integer number (484894698165).

Almost surely, 2^{1616315660545} is an apocalyptic number.

It is an amenable number.

1616315660545 is a deficient number, since it is larger than the sum of its proper divisors (323263132115).

1616315660545 is an equidigital number, since it uses as much as digits as its factorization.

1616315660545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323263132114.

The product of its (nonzero) digits is 1944000, while the sum is 49.

The spelling of 1616315660545 in words is "one trillion, six hundred sixteen billion, three hundred fifteen million, six hundred sixty thousand, five hundred forty-five".