1213664647453 has 4 divisors (see below), whose sum is σ = 1213853492320. Its totient is φ = 1213475802588.

The previous prime is 1213664647379. The next prime is 1213664647483. The reversal of 1213664647453 is 3547464663121.

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 a de Polignac number, because none of the positive numbers 2^k-1213664647453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213664647453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213664647483) 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, 94412793 + ... + 94425646.

It is an arithmetic number, because the mean of its divisors is an integer number (303463373080).

Almost surely, 2^{1213664647453} is an apocalyptic number.

It is an amenable number.

1213664647453 is a deficient number, since it is larger than the sum of its proper divisors (188844867).

1213664647453 is an equidigital number, since it uses as much as digits as its factorization.

1213664647453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188844866.

The product of its digits is 8709120, while the sum is 52.

The spelling of 1213664647453 in words is "one trillion, two hundred thirteen billion, six hundred sixty-four million, six hundred forty-seven thousand, four hundred fifty-three".