1616880445 has 8 divisors (see below), whose sum is σ = 1945246680. Its totient is φ = 1290177600.

The previous prime is 1616880443. The next prime is 1616880509. The reversal of 1616880445 is 5440886161.

It can be written as a sum of positive squares in 4 ways, for example, as 226261764 + 1390618681 = 15042^2 + 37291^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1616880445 - 2¹ = 1616880443 is a prime.

It is a super-2 number, since 2×1616880445² = 5228604746846796050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616880443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 413706 + ... + 417595.

It is an arithmetic number, because the mean of its divisors is an integer number (243155835).

Almost surely, 2^1616880445 is an apocalyptic number.

It is an amenable number.

1616880445 is a deficient number, since it is larger than the sum of its proper divisors (328366235).

1616880445 is an equidigital number, since it uses as much as digits as its factorization.

1616880445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831695.

The product of its (nonzero) digits is 184320, while the sum is 43.

The square root of 1616880445 is about 40210.4519372762. The cubic root of 1616880445 is about 1173.7059409667.

The spelling of 1616880445 in words is "one billion, six hundred sixteen million, eight hundred eighty thousand, four hundred forty-five".