1639118545 has 8 divisors (see below), whose sum is σ = 2004054696. Its totient is φ = 1286553216.

The previous prime is 1639118519. The next prime is 1639118549. The reversal of 1639118545 is 5458119361.

It can be written as a sum of positive squares in 4 ways, for example, as 97535376 + 1541583169 = 9876^2 + 39263^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1639118545 - 2¹¹ = 1639116497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1639118549) 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, 3092412 + ... + 3092941.

It is an arithmetic number, because the mean of its divisors is an integer number (250506837).

Almost surely, 2^1639118545 is an apocalyptic number.

It is an amenable number.

1639118545 is a deficient number, since it is larger than the sum of its proper divisors (364936151).

1639118545 is an equidigital number, since it uses as much as digits as its factorization.

1639118545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6185411.

The product of its digits is 129600, while the sum is 43.

The square root of 1639118545 is about 40486.0290100178. The cubic root of 1639118545 is about 1179.0623943778.

The spelling of 1639118545 in words is "one billion, six hundred thirty-nine million, one hundred eighteen thousand, five hundred forty-five".