66660505555 has 16 divisors (see below), whose sum is σ = 91427364864. Its totient is φ = 45706439520.

The previous prime is 66660505531. The next prime is 66660505601. The reversal of 66660505555 is 55550506666.

It is not a de Polignac number, because 66660505555 - 2¹³ = 66660497363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66660505499 and 66660505508.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 418110 + ... + 555100.

It is an arithmetic number, because the mean of its divisors is an integer number (5714210304).

Almost surely, 2^66660505555 is an apocalyptic number.

66660505555 is a deficient number, since it is larger than the sum of its proper divisors (24766859309).

66660505555 is a wasteful number, since it uses less digits than its factorization.

66660505555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150906.

The product of its (nonzero) digits is 4050000, while the sum is 49.

The spelling of 66660505555 in words is "sixty-six billion, six hundred sixty million, five hundred five thousand, five hundred fifty-five".