645553435 has 8 divisors (see below), whose sum is σ = 774952416. Its totient is φ = 516250560.

The previous prime is 645553411. The next prime is 645553457. The reversal of 645553435 is 534355546.

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

It is not a de Polignac number, because 645553435 - 2⁹ = 645552923 is a prime.

It is a Duffinian 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, 8311 + ... + 36880.

It is an arithmetic number, because the mean of its divisors is an integer number (96869052).

Almost surely, 2^645553435 is an apocalyptic number.

645553435 is a deficient number, since it is larger than the sum of its proper divisors (129398981).

645553435 is a wasteful number, since it uses less digits than its factorization.

645553435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48053.

The product of its digits is 540000, while the sum is 40.

The square root of 645553435 is about 25407.7436030829. The cubic root of 645553435 is about 864.2593077950.

The spelling of 645553435 in words is "six hundred forty-five million, five hundred fifty-three thousand, four hundred thirty-five".