1645536556003 has 4 divisors (see below), whose sum is σ = 1645712728128. Its totient is φ = 1645360383880.

The previous prime is 1645536555917. The next prime is 1645536556009. The reversal of 1645536556003 is 3006556355461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1645536556003 is a prime.

It is a super-3 number, since 3×1645536556003³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645536556009) 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, 88072051 + ... + 88090732.

It is an arithmetic number, because the mean of its divisors is an integer number (411428182032).

Almost surely, 2^{1645536556003} is an apocalyptic number.

1645536556003 is a deficient number, since it is larger than the sum of its proper divisors (176172125).

1645536556003 is an equidigital number, since it uses as much as digits as its factorization.

1645536556003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176172124.

The product of its (nonzero) digits is 4860000, while the sum is 49.

The spelling of 1645536556003 in words is "one trillion, six hundred forty-five billion, five hundred thirty-six million, five hundred fifty-six thousand, three".