1605416656 has 20 divisors (see below), whose sum is σ = 3121732612. Its totient is φ = 799808256.

The previous prime is 1605416633. The next prime is 1605416669. The reversal of 1605416656 is 6566145061.

It can be written as a sum of positive squares in 2 ways, for example, as 528264256 + 1077152400 = 22984^2 + 32820^2 .

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, 176685 + ... + 185548.

Almost surely, 2^1605416656 is an apocalyptic number.

1605416656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1605416656 is a deficient number, since it is larger than the sum of its proper divisors (1516315956).

1605416656 is a wasteful number, since it uses less digits than its factorization.

1605416656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362518 (or 362512 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 1605416656 is about 40067.6509917914. The cubic root of 1605416656 is about 1170.9254751692.

The spelling of 1605416656 in words is "one billion, six hundred five million, four hundred sixteen thousand, six hundred fifty-six".