27788617820545 has 32 divisors (see below), whose sum is σ = 34000194908160. Its totient is φ = 21799267015680.

The previous prime is 27788617820531. The next prime is 27788617820567. The reversal of 27788617820545 is 54502871688772.

It is not a de Polignac number, because 27788617820545 - 2⁷ = 27788617820417 is a prime.

It is a super-2 number, since 2×27788617820545² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142376794 + ... + 142571836.

It is an arithmetic number, because the mean of its divisors is an integer number (1062506090880).

Almost surely, 2^{27788617820545} is an apocalyptic number.

It is an amenable number.

27788617820545 is a deficient number, since it is larger than the sum of its proper divisors (6211577087615).

27788617820545 is a wasteful number, since it uses less digits than its factorization.

27788617820545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197785.

The product of its (nonzero) digits is 421478400, while the sum is 70.

The spelling of 27788617820545 in words is "twenty-seven trillion, seven hundred eighty-eight billion, six hundred seventeen million, eight hundred twenty thousand, five hundred forty-five".