1605201616 has 20 divisors (see below), whose sum is σ = 3110701572. Its totient is φ = 802439936.

The previous prime is 1605201593. The next prime is 1605201617. The reversal of 1605201616 is 6161025061.

It can be written as a sum of positive squares in 2 ways, for example, as 763969600 + 841232016 = 27640^2 + 29004^2 .

It is a super-2 number, since 2×1605201616² = 5153344456018022912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605201617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141300 + ... + 152236.

Almost surely, 2^1605201616 is an apocalyptic number.

1605201616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1605201616 is a deficient number, since it is larger than the sum of its proper divisors (1505499956).

1605201616 is a wasteful number, since it uses less digits than its factorization.

1605201616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20118 (or 20112 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1605201616 is about 40064.9674403961. The cubic root of 1605201616 is about 1170.8731923643.

Adding to 1605201616 its reverse (6161025061), we get a palindrome (7766226677).

The spelling of 1605201616 in words is "one billion, six hundred five million, two hundred one thousand, six hundred sixteen".