1643700453 has 4 divisors (see below), whose sum is σ = 2191600608. Its totient is φ = 1095800300.

The previous prime is 1643700391. The next prime is 1643700491. The reversal of 1643700453 is 3540073461.

1643700453 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1643700453 - 2¹⁶ = 1643634917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643708453) 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, 273950073 + ... + 273950078.

It is an arithmetic number, because the mean of its divisors is an integer number (547900152).

Almost surely, 2^1643700453 is an apocalyptic number.

It is an amenable number.

1643700453 is a deficient number, since it is larger than the sum of its proper divisors (547900155).

1643700453 is an equidigital number, since it uses as much as digits as its factorization.

1643700453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547900154.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 1643700453 is about 40542.5758061818. The cubic root of 1643700453 is about 1180.1600024823.

The spelling of 1643700453 in words is "one billion, six hundred forty-three million, seven hundred thousand, four hundred fifty-three".