1331643655 has 4 divisors (see below), whose sum is σ = 1597972392. Its totient is φ = 1065314920.

The previous prime is 1331643647. The next prime is 1331643667. The reversal of 1331643655 is 5563461331.

It is a happy number.

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

It is not a de Polignac number, because 1331643655 - 2³ = 1331643647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 133164361 + ... + 133164370.

It is an arithmetic number, because the mean of its divisors is an integer number (399493098).

Almost surely, 2^1331643655 is an apocalyptic number.

1331643655 is a deficient number, since it is larger than the sum of its proper divisors (266328737).

1331643655 is an equidigital number, since it uses as much as digits as its factorization.

1331643655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266328736.

The product of its digits is 97200, while the sum is 37.

The square root of 1331643655 is about 36491.6929588091. The cubic root of 1331643655 is about 1100.1772868522.

The spelling of 1331643655 in words is "one billion, three hundred thirty-one million, six hundred forty-three thousand, six hundred fifty-five".