27545407666 has 64 divisors (see below), whose sum is σ = 50381568000. Its totient is φ = 11025932544.

The previous prime is 27545407663. The next prime is 27545407697. The reversal of 27545407666 is 66670454572.

It is a super-2 number, since 2×27545407666² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27545407663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35000125 + ... + 35000911.

It is an arithmetic number, because the mean of its divisors is an integer number (787212000).

Almost surely, 2^27545407666 is an apocalyptic number.

27545407666 is a deficient number, since it is larger than the sum of its proper divisors (22836160334).

27545407666 is a wasteful number, since it uses less digits than its factorization.

27545407666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751.

The product of its (nonzero) digits is 8467200, while the sum is 52.

The spelling of 27545407666 in words is "twenty-seven billion, five hundred forty-five million, four hundred seven thousand, six hundred sixty-six".