27770855581 has 32 divisors (see below), whose sum is σ = 34034466816. Its totient is φ = 22156848000.

The previous prime is 27770855579. The next prime is 27770855599. The reversal of 27770855581 is 18555807772.

It is not a de Polignac number, because 27770855581 - 2¹ = 27770855579 is a prime.

It is a super-2 number, since 2×27770855581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27770855501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 609706 + ... + 653668.

It is an arithmetic number, because the mean of its divisors is an integer number (1063577088).

Almost surely, 2^27770855581 is an apocalyptic number.

It is an amenable number.

27770855581 is a deficient number, since it is larger than the sum of its proper divisors (6263611235).

27770855581 is a wasteful number, since it uses less digits than its factorization.

27770855581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44113.

The product of its (nonzero) digits is 5488000, while the sum is 55.

The spelling of 27770855581 in words is "twenty-seven billion, seven hundred seventy million, eight hundred fifty-five thousand, five hundred eighty-one".