1643475742346 has 4 divisors (see below), whose sum is σ = 2465213613522. Its totient is φ = 821737871172.

The previous prime is 1643475742333. The next prime is 1643475742361. The reversal of 1643475742346 is 6432475743461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1526433069121 + 117042673225 = 1235489^2 + 342115^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1643475742291 and 1643475742300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410868935585 + ... + 410868935588.

Almost surely, 2^{1643475742346} is an apocalyptic number.

1643475742346 is a deficient number, since it is larger than the sum of its proper divisors (821737871176).

1643475742346 is an equidigital number, since it uses as much as digits as its factorization.

1643475742346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821737871175.

The product of its digits is 40642560, while the sum is 56.

The spelling of 1643475742346 in words is "one trillion, six hundred forty-three billion, four hundred seventy-five million, seven hundred forty-two thousand, three hundred forty-six".