1601565660 has 72 divisors (see below), whose sum is σ = 4949773920. Its totient is φ = 419023488.

The previous prime is 1601565653. The next prime is 1601565697. The reversal of 1601565660 is 665651061.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74400 + ... + 93479.

It is an arithmetic number, because the mean of its divisors is an integer number (68746860).

Almost surely, 2^1601565660 is an apocalyptic number.

1601565660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1601565660 is an abundant number, since it is smaller than the sum of its proper divisors (3348208260).

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

1601565660 is a wasteful number, since it uses less digits than its factorization.

1601565660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167947 (or 167942 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 1601565660 is about 40019.5659646628. The cubic root of 1601565660 is about 1169.9884723826.

The spelling of 1601565660 in words is "one billion, six hundred one million, five hundred sixty-five thousand, six hundred sixty".