1643362445 has 8 divisors (see below), whose sum is σ = 1985095680. Its totient is φ = 1305982800.

The previous prime is 1643362429. The next prime is 1643362447. The reversal of 1643362445 is 5442633461.

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

It is not a de Polignac number, because 1643362445 - 2⁴ = 1643362429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1643362399 and 1643362408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643362447) 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, 1087565 + ... + 1089074.

It is an arithmetic number, because the mean of its divisors is an integer number (248136960).

Almost surely, 2^1643362445 is an apocalyptic number.

It is an amenable number.

1643362445 is a deficient number, since it is larger than the sum of its proper divisors (341733235).

1643362445 is a wasteful number, since it uses less digits than its factorization.

1643362445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176795.

The product of its digits is 207360, while the sum is 38.

The square root of 1643362445 is about 40538.4070357975. The cubic root of 1643362445 is about 1180.0791015153.

The spelling of 1643362445 in words is "one billion, six hundred forty-three million, three hundred sixty-two thousand, four hundred forty-five".