66243148453 has 4 divisors (see below), whose sum is σ = 66244220460. Its totient is φ = 66242076448.

The previous prime is 66243148409. The next prime is 66243148487. The reversal of 66243148453 is 35484134266.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19189729729 + 47053418724 = 138527^2 + 216918^2 .

It is a cyclic number.

It is not a de Polignac number, because 66243148453 - 2²⁹ = 65706277541 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 (66243148403) 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, 437248 + ... + 568921.

It is an arithmetic number, because the mean of its divisors is an integer number (16561055115).

Almost surely, 2^66243148453 is an apocalyptic number.

It is an amenable number.

66243148453 is a deficient number, since it is larger than the sum of its proper divisors (1072007).

66243148453 is a wasteful number, since it uses less digits than its factorization.

66243148453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072006.

The product of its digits is 1658880, while the sum is 46.

The spelling of 66243148453 in words is "sixty-six billion, two hundred forty-three million, one hundred forty-eight thousand, four hundred fifty-three".