27857577561 has 16 divisors (see below), whose sum is σ = 42903649728. Its totient is φ = 15890240000.

The previous prime is 27857577541. The next prime is 27857577577. The reversal of 27857577561 is 16577575872.

It is a happy number.

It is not a de Polignac number, because 27857577561 - 2¹¹ = 27857575513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27857577495 and 27857577504.

It is not an unprimeable number, because it can be changed into a prime (27857577541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24827940 + ... + 24829061.

It is an arithmetic number, because the mean of its divisors is an integer number (2681478108).

Almost surely, 2^27857577561 is an apocalyptic number.

It is an amenable number.

27857577561 is a deficient number, since it is larger than the sum of its proper divisors (15046072167).

27857577561 is a wasteful number, since it uses less digits than its factorization.

27857577561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49657032.

The product of its digits is 28812000, while the sum is 60.

The spelling of 27857577561 in words is "twenty-seven billion, eight hundred fifty-seven million, five hundred seventy-seven thousand, five hundred sixty-one".