1645730028743 has 4 divisors (see below), whose sum is σ = 1645830290640. Its totient is φ = 1645629766848.

The previous prime is 1645730028721. The next prime is 1645730028791. The reversal of 1645730028743 is 3478200375461.

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

It is a cyclic number.

It is not a de Polignac number, because 1645730028743 - 2²⁰ = 1645728980167 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1645730028691 and 1645730028700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645730021743) 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, 50106323 + ... + 50139156.

It is an arithmetic number, because the mean of its divisors is an integer number (411457572660).

Almost surely, 2^{1645730028743} is an apocalyptic number.

1645730028743 is a deficient number, since it is larger than the sum of its proper divisors (100261897).

1645730028743 is a wasteful number, since it uses less digits than its factorization.

1645730028743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100261896.

The product of its (nonzero) digits is 3386880, while the sum is 50.

The spelling of 1645730028743 in words is "one trillion, six hundred forty-five billion, seven hundred thirty million, twenty-eight thousand, seven hundred forty-three".