1645503939393 has 8 divisors (see below), whose sum is σ = 2194592056800. Its totient is φ = 1096709224128.

The previous prime is 1645503939301. The next prime is 1645503939403. The reversal of 1645503939393 is 3939393055461.

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

It is not a de Polignac number, because 1645503939393 - 2¹⁰ = 1645503938369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645503935393) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 73337448 + ... + 73359881.

It is an arithmetic number, because the mean of its divisors is an integer number (274324007100).

Almost surely, 2^{1645503939393} is an apocalyptic number.

It is an amenable number.

1645503939393 is a deficient number, since it is larger than the sum of its proper divisors (549088117407).

1645503939393 is a wasteful number, since it uses less digits than its factorization.

1645503939393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146701071.

The product of its (nonzero) digits is 35429400, while the sum is 60.

The spelling of 1645503939393 in words is "one trillion, six hundred forty-five billion, five hundred three million, nine hundred thirty-nine thousand, three hundred ninety-three".