1235681568013 has 4 divisors (see below), whose sum is σ = 1240275180060. Its totient is φ = 1231087955968.

The previous prime is 1235681568001. The next prime is 1235681568031. The reversal of 1235681568013 is 3108651865321.

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 480445832164 + 755235735849 = 693142^2 + 869043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1235681568013 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 (1235681568413) 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, 2296805620 + ... + 2296806157.

It is an arithmetic number, because the mean of its divisors is an integer number (310068795015).

Almost surely, 2^{1235681568013} is an apocalyptic number.

It is an amenable number.

1235681568013 is a deficient number, since it is larger than the sum of its proper divisors (4593612047).

1235681568013 is an equidigital number, since it uses as much as digits as its factorization.

1235681568013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4593612046.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 1235681568013 in words is "one trillion, two hundred thirty-five billion, six hundred eighty-one million, five hundred sixty-eight thousand, thirteen".