1555661330 has 32 divisors (see below), whose sum is σ = 2966879664. Its totient is φ = 585271296.

The previous prime is 1555661329. The next prime is 1555661339. The reversal of 1555661330 is 331665551.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1554015241 + 1646089 = 39421^2 + 1283^2 .

It is not an unprimeable number, because it can be changed into a prime (1555661339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 459524 + ... + 462896.

Almost surely, 2^1555661330 is an apocalyptic number.

1555661330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1555661330 is a deficient number, since it is larger than the sum of its proper divisors (1411218334).

1555661330 is a wasteful number, since it uses less digits than its factorization.

1555661330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6110.

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

The square root of 1555661330 is about 39441.8728003628. The cubic root of 1555661330 is about 1158.7018101850.

The spelling of 1555661330 in words is "one billion, five hundred fifty-five million, six hundred sixty-one thousand, three hundred thirty".