1643225073 has 8 divisors (see below), whose sum is σ = 2503962048. Its totient is φ = 938985744.

The previous prime is 1643225063. The next prime is 1643225099. The reversal of 1643225073 is 3705223461.

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

It is not a de Polignac number, because 1643225073 - 2⁶ = 1643225009 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1643225063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39124386 + ... + 39124427.

It is an arithmetic number, because the mean of its divisors is an integer number (312995256).

Almost surely, 2^1643225073 is an apocalyptic number.

It is an amenable number.

1643225073 is a deficient number, since it is larger than the sum of its proper divisors (860736975).

1643225073 is an equidigital number, since it uses as much as digits as its factorization.

1643225073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78248823.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 1643225073 is about 40536.7126565537. The cubic root of 1643225073 is about 1180.0462188638.

The spelling of 1643225073 in words is "one billion, six hundred forty-three million, two hundred twenty-five thousand, seventy-three".