743645005405 has 4 divisors (see below), whose sum is σ = 892374006492. Its totient is φ = 594916004320.

The previous prime is 743645005403. The next prime is 743645005423. The reversal of 743645005405 is 504500546347.

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

It can be written as a sum of positive squares in 2 ways, for example, as 413877348889 + 329767656516 = 643333^2 + 574254^2 .

It is not a de Polignac number, because 743645005405 - 2¹ = 743645005403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (743645005403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74364500536 + ... + 74364500545.

It is an arithmetic number, because the mean of its divisors is an integer number (223093501623).

Almost surely, 2^743645005405 is an apocalyptic number.

It is an amenable number.

743645005405 is a deficient number, since it is larger than the sum of its proper divisors (148729001087).

743645005405 is a wasteful number, since it uses less digits than its factorization.

743645005405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148729001086.

The product of its (nonzero) digits is 1008000, while the sum is 43.

The spelling of 743645005405 in words is "seven hundred forty-three billion, six hundred forty-five million, five thousand, four hundred five".