1311423515645 has 8 divisors (see below), whose sum is σ = 1584270019800. Its totient is φ = 1042097611840.

The previous prime is 1311423515593. The next prime is 1311423515669. The reversal of 1311423515645 is 5465153241131.

It can be written as a sum of positive squares in 4 ways, for example, as 51257865604 + 1260165650041 = 226402^2 + 1122571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1311423515645 - 2²² = 1311419321341 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 880149266 + ... + 880150755.

It is an arithmetic number, because the mean of its divisors is an integer number (198033752475).

Almost surely, 2^{1311423515645} is an apocalyptic number.

It is an amenable number.

1311423515645 is a deficient number, since it is larger than the sum of its proper divisors (272846504155).

1311423515645 is a wasteful number, since it uses less digits than its factorization.

1311423515645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760300175.

The product of its digits is 216000, while the sum is 41.

Adding to 1311423515645 its reverse (5465153241131), we get a palindrome (6776576756776).

The spelling of 1311423515645 in words is "one trillion, three hundred eleven billion, four hundred twenty-three million, five hundred fifteen thousand, six hundred forty-five".