1605611610 has 48 divisors (see below), whose sum is σ = 4178963880. Its totient is φ = 427714560.

The previous prime is 1605611599. The next prime is 1605611611. The reversal of 1605611610 is 161165061.

It can be written as a sum of positive squares in 4 ways, for example, as 969512769 + 636098841 = 31137^2 + 25221^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1605611611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81970 + ... + 99650.

Almost surely, 2^1605611610 is an apocalyptic number.

1605611610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1605611610 is an abundant number, since it is smaller than the sum of its proper divisors (2573352270).

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

1605611610 is a wasteful number, since it uses less digits than its factorization.

1605611610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18703 (or 18700 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1605611610 is about 40070.0837283877. The cubic root of 1605611610 is about 1170.9728704180.

Adding to 1605611610 its reverse (161165061), we get a palindrome (1766776671).

The spelling of 1605611610 in words is "one billion, six hundred five million, six hundred eleven thousand, six hundred ten".