1645356543446 has 32 divisors (see below), whose sum is σ = 3107496096000. Its totient is φ = 634700988000.

The previous prime is 1645356543431. The next prime is 1645356543533. The reversal of 1645356543446 is 6443456535461.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1645356543391 and 1645356543400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52876196 + ... + 52907303.

It is an arithmetic number, because the mean of its divisors is an integer number (97109253000).

Almost surely, 2^{1645356543446} is an apocalyptic number.

1645356543446 is a deficient number, since it is larger than the sum of its proper divisors (1462139552554).

1645356543446 is a wasteful number, since it uses less digits than its factorization.

1645356543446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105783620.

The product of its digits is 62208000, while the sum is 56.

The spelling of 1645356543446 in words is "one trillion, six hundred forty-five billion, three hundred fifty-six million, five hundred forty-three thousand, four hundred forty-six".