1331665567 has 4 divisors (see below), whose sum is σ = 1345394176. Its totient is φ = 1317936960.

The previous prime is 1331665541. The next prime is 1331665583. The reversal of 1331665567 is 7655661331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7655661331 = 8231 ⋅930101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331665567 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 (1331660567) 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, 6864159 + ... + 6864352.

It is an arithmetic number, because the mean of its divisors is an integer number (336348544).

Almost surely, 2^1331665567 is an apocalyptic number.

1331665567 is a deficient number, since it is larger than the sum of its proper divisors (13728609).

1331665567 is an equidigital number, since it uses as much as digits as its factorization.

1331665567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13728608.

The product of its digits is 340200, while the sum is 43.

The square root of 1331665567 is about 36491.9931902876. The cubic root of 1331665567 is about 1100.1833212374.

The spelling of 1331665567 in words is "one billion, three hundred thirty-one million, six hundred sixty-five thousand, five hundred sixty-seven".