1643453063 has 16 divisors (see below), whose sum is σ = 1967569920. Its totient is φ = 1342150656.

The previous prime is 1643453057. The next prime is 1643453099. The reversal of 1643453063 is 3603543461.

It is not a de Polignac number, because 1643453063 - 2⁶ = 1643452999 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 (1643453023) 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, 21518 + ... + 61236.

It is an arithmetic number, because the mean of its divisors is an integer number (122973120).

Almost surely, 2^1643453063 is an apocalyptic number.

1643453063 is a deficient number, since it is larger than the sum of its proper divisors (324116857).

1643453063 is a wasteful number, since it uses less digits than its factorization.

1643453063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40006.

The product of its (nonzero) digits is 77760, while the sum is 35.

The square root of 1643453063 is about 40539.5247012098. The cubic root of 1643453063 is about 1180.1007916873.

The spelling of 1643453063 in words is "one billion, six hundred forty-three million, four hundred fifty-three thousand, sixty-three".