13540550066 has 4 divisors (see below), whose sum is σ = 20310825102. Its totient is φ = 6770275032.

The previous prime is 13540550039. The next prime is 13540550077. The reversal of 13540550066 is 66005504531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66005504531 = 4733 ⋅13945807.

It can be written as a sum of positive squares in only one way, i.e., 9949065025 + 3591485041 = 99745^2 + 59929^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3385137515 + ... + 3385137518.

Almost surely, 2^13540550066 is an apocalyptic number.

13540550066 is a deficient number, since it is larger than the sum of its proper divisors (6770275036).

13540550066 is an equidigital number, since it uses as much as digits as its factorization.

13540550066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6770275035.

The product of its (nonzero) digits is 54000, while the sum is 35.

The spelling of 13540550066 in words is "thirteen billion, five hundred forty million, five hundred fifty thousand, sixty-six".