1638060561 has 12 divisors (see below), whose sum is σ = 2366807040. Its totient is φ = 1091708280.

The previous prime is 1638060499. The next prime is 1638060569. The reversal of 1638060561 is 1650608361.

It is a happy number.

1638060561 is a `hidden beast` number, since 1 + 6 + 38 + 0 + 60 + 561 = 666.

It is not a de Polignac number, because 1638060561 - 2³⁰ = 564318737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1638060569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5680 + ... + 57518.

It is an arithmetic number, because the mean of its divisors is an integer number (197233920).

Almost surely, 2^1638060561 is an apocalyptic number.

It is an amenable number.

1638060561 is a deficient number, since it is larger than the sum of its proper divisors (728746479).

1638060561 is a wasteful number, since it uses less digits than its factorization.

1638060561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55356 (or 55353 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1638060561 is about 40472.9608627785. The cubic root of 1638060561 is about 1178.8086609232.

The spelling of 1638060561 in words is "one billion, six hundred thirty-eight million, sixty thousand, five hundred sixty-one".