27555527505555 has 768 divisors, whose sum is σ = 62600159232000. Its totient is φ = 11153456455680.

The previous prime is 27555527505553. The next prime is 27555527505559. The reversal of 27555527505555 is 55550572555572.

It is a happy number.

27555527505555 is a `hidden beast` number, since 2 + 7 + 5 + 5 + 5 + 5 + 2 + 75 + 0 + 5 + 555 = 666.

It is not a de Polignac number, because 27555527505555 - 2¹ = 27555527505553 is a prime.

It is a super-2 number, since 2×27555527505555² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 27555527505492 and 27555527505501.

It is not an unprimeable number, because it can be changed into a prime (27555527505553) by changing a digit.

It is a polite number, since it can be written in 767 ways as a sum of consecutive naturals, for example, 78060984259 + ... + 78060984611.

It is an arithmetic number, because the mean of its divisors is an integer number (81510624000).

Almost surely, 2^{27555527505555} is an apocalyptic number.

27555527505555 is an abundant number, since it is smaller than the sum of its proper divisors (35044631726445).

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

27555527505555 is a wasteful number, since it uses less digits than its factorization.

27555527505555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 382812500, while the sum is 63.

The spelling of 27555527505555 in words is "twenty-seven trillion, five hundred fifty-five billion, five hundred twenty-seven million, five hundred five thousand, five hundred fifty-five".