1315671665 has 32 divisors (see below), whose sum is σ = 1976189184. Its totient is φ = 816906240.

The previous prime is 1315671661. The next prime is 1315671683. The reversal of 1315671665 is 5661765131.

It is a happy number.

It is not a de Polignac number, because 1315671665 - 2² = 1315671661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315671661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92297 + ... + 105593.

It is an arithmetic number, because the mean of its divisors is an integer number (61755912).

Almost surely, 2^1315671665 is an apocalyptic number.

It is an amenable number.

1315671665 is a deficient number, since it is larger than the sum of its proper divisors (660517519).

1315671665 is a wasteful number, since it uses less digits than its factorization.

1315671665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13577.

The product of its digits is 113400, while the sum is 41.

The square root of 1315671665 is about 36272.1885885040. The cubic root of 1315671665 is about 1095.7610036290.

The spelling of 1315671665 in words is "one billion, three hundred fifteen million, six hundred seventy-one thousand, six hundred sixty-five".