1605615560 has 16 divisors (see below), whose sum is σ = 3612635100. Its totient is φ = 642246208.

The previous prime is 1605615553. The next prime is 1605615611. The reversal of 1605615560 is 655165061.

It can be written as a sum of positive squares in 2 ways, for example, as 1604643364 + 972196 = 40058^2 + 986^2 .

It is a super-2 number, since 2×1605615560² = 5156002653028227200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1605615560.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20070155 + ... + 20070234.

Almost surely, 2^1605615560 is an apocalyptic number.

1605615560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605615560 is an abundant number, since it is smaller than the sum of its proper divisors (2007019540).

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

1605615560 is a wasteful number, since it uses less digits than its factorization.

1605615560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40140400 (or 40140396 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 1605615560 is about 40070.1330169991. The cubic root of 1605615560 is about 1170.9738306624.

The spelling of 1605615560 in words is "one billion, six hundred five million, six hundred fifteen thousand, five hundred sixty".