1330661555 has 8 divisors (see below), whose sum is σ = 1600048944. Its totient is φ = 1062359200.

The previous prime is 1330661539. The next prime is 1330661557. The reversal of 1330661555 is 5551660331.

It is a happy number.

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

It is not a de Polignac number, because 1330661555 - 2⁴ = 1330661539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1330661557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268556 + ... + 273465.

It is an arithmetic number, because the mean of its divisors is an integer number (200006118).

Almost surely, 2^1330661555 is an apocalyptic number.

1330661555 is a deficient number, since it is larger than the sum of its proper divisors (269387389).

1330661555 is an equidigital number, since it uses as much as digits as its factorization.

1330661555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542517.

The product of its (nonzero) digits is 40500, while the sum is 35.

The square root of 1330661555 is about 36478.2339895999. The cubic root of 1330661555 is about 1099.9067565591.

The spelling of 1330661555 in words is "one billion, three hundred thirty million, six hundred sixty-one thousand, five hundred fifty-five".