1643245121003 has 16 divisors (see below), whose sum is σ = 1688445565056. Its totient is φ = 1598477184000.

The previous prime is 1643245120997. The next prime is 1643245121071. The reversal of 1643245121003 is 3001215423461.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1643245121003 is a prime.

It is a super-2 number, since 2×1643245121003² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1643245121083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26907503 + ... + 26968503.

It is an arithmetic number, because the mean of its divisors is an integer number (105527847816).

Almost surely, 2^{1643245121003} is an apocalyptic number.

1643245121003 is a deficient number, since it is larger than the sum of its proper divisors (45200444053).

1643245121003 is a wasteful number, since it uses less digits than its factorization.

1643245121003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64534.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 1643245121003 in words is "one trillion, six hundred forty-three billion, two hundred forty-five million, one hundred twenty-one thousand, three".