1645000242243 has 4 divisors (see below), whose sum is σ = 2193333656328. Its totient is φ = 1096666828160.

The previous prime is 1645000242239. The next prime is 1645000242247. The reversal of 1645000242243 is 3422420005461.

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

It is an interprime number because it is at equal distance from previous prime (1645000242239) and next prime (1645000242247).

It is a cyclic number.

It is not a de Polignac number, because 1645000242243 - 2² = 1645000242239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645000242247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274166707038 + ... + 274166707043.

It is an arithmetic number, because the mean of its divisors is an integer number (548333414082).

Almost surely, 2^{1645000242243} is an apocalyptic number.

1645000242243 is a deficient number, since it is larger than the sum of its proper divisors (548333414085).

1645000242243 is an equidigital number, since it uses as much as digits as its factorization.

1645000242243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548333414084.

The product of its (nonzero) digits is 46080, while the sum is 33.

The spelling of 1645000242243 in words is "one trillion, six hundred forty-five billion, two hundred forty-two thousand, two hundred forty-three".