1605661330 has 32 divisors (see below), whose sum is σ = 3557159424. Its totient is φ = 508165056.

The previous prime is 1605661319. The next prime is 1605661363. The reversal of 1605661330 is 331665061.

It is a junction number, because it is equal to n+sod(n) for n = 1605661292 and 1605661301.

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 15 ways as a sum of consecutive naturals, for example, 881322 + ... + 883141.

It is an arithmetic number, because the mean of its divisors is an integer number (111161232).

Almost surely, 2^1605661330 is an apocalyptic number.

1605661330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1605661330 is an abundant number, since it is smaller than the sum of its proper divisors (1951498094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1605661330 is a wasteful number, since it uses less digits than its factorization.

1605661330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764490.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 1605661330 is about 40070.7041365634. The cubic root of 1605661330 is about 1170.9849572285.

The spelling of 1605661330 in words is "one billion, six hundred five million, six hundred sixty-one thousand, three hundred thirty".