1643236501453 has 16 divisors (see below), whose sum is σ = 1685469083760. Its totient is φ = 1601558728704.

The previous prime is 1643236501447. The next prime is 1643236501457. The reversal of 1643236501453 is 3541056323461.

It can be written as a sum of positive squares in 8 ways, for example, as 7083410569 + 1636153090884 = 84163^2 + 1279122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1643236501453 is a prime.

It is a super-2 number, since 2×1643236501453² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643236501457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10924725 + ... + 11074117.

It is an arithmetic number, because the mean of its divisors is an integer number (105341817735).

Almost surely, 2^{1643236501453} is an apocalyptic number.

It is an amenable number.

1643236501453 is a deficient number, since it is larger than the sum of its proper divisors (42232582307).

1643236501453 is a wasteful number, since it uses less digits than its factorization.

1643236501453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151248.

The product of its (nonzero) digits is 777600, while the sum is 43.

The spelling of 1643236501453 in words is "one trillion, six hundred forty-three billion, two hundred thirty-six million, five hundred one thousand, four hundred fifty-three".