1311616631615 has 4 divisors (see below), whose sum is σ = 1573939957944. Its totient is φ = 1049293305288.

The previous prime is 1311616631539. The next prime is 1311616631639. The reversal of 1311616631615 is 5161366161131.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1311616631615 - 2⁴⁰ = 212105003839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131161663157 + ... + 131161663166.

It is an arithmetic number, because the mean of its divisors is an integer number (393484989486).

Almost surely, 2^{1311616631615} is an apocalyptic number.

1311616631615 is a deficient number, since it is larger than the sum of its proper divisors (262323326329).

1311616631615 is an equidigital number, since it uses as much as digits as its factorization.

1311616631615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262323326328.

The product of its digits is 58320, while the sum is 41.

The spelling of 1311616631615 in words is "one trillion, three hundred eleven billion, six hundred sixteen million, six hundred thirty-one thousand, six hundred fifteen".