1605520660 has 24 divisors (see below), whose sum is σ = 3392284896. Its totient is φ = 638267040.

The previous prime is 1605520639. The next prime is 1605520661. The reversal of 1605520660 is 660255061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605520661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242986 + ... + 249505.

It is an arithmetic number, because the mean of its divisors is an integer number (141345204).

Almost surely, 2^1605520660 is an apocalyptic number.

1605520660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605520660 is an abundant number, since it is smaller than the sum of its proper divisors (1786764236).

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

1605520660 is a wasteful number, since it uses less digits than its factorization.

1605520660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492663 (or 492661 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1605520660 is about 40068.9488257429. The cubic root of 1605520660 is about 1170.9507600494.

The spelling of 1605520660 in words is "one billion, six hundred five million, five hundred twenty thousand, six hundred sixty".