1639075645 has 8 divisors (see below), whose sum is σ = 1975712256. Its totient is φ = 1305379536.

The previous prime is 1639075609. The next prime is 1639075661. The reversal of 1639075645 is 5465709361.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1639075645 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1639075595 and 1639075604.

It is a congruent number.

It is an unprimeable number.

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, 733897 + ... + 736126.

It is an arithmetic number, because the mean of its divisors is an integer number (246964032).

Almost surely, 2^1639075645 is an apocalyptic number.

It is an amenable number.

1639075645 is a deficient number, since it is larger than the sum of its proper divisors (336636611).

1639075645 is a wasteful number, since it uses less digits than its factorization.

1639075645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470251.

The product of its (nonzero) digits is 680400, while the sum is 46.

The square root of 1639075645 is about 40485.4991941559. The cubic root of 1639075645 is about 1179.0521079105.

The spelling of 1639075645 in words is "one billion, six hundred thirty-nine million, seventy-five thousand, six hundred forty-five".