66155506066 has 8 divisors (see below), whose sum is σ = 106866586764. Its totient is φ = 30533310480.

The previous prime is 66155506049. The next prime is 66155506129. The reversal of 66155506066 is 66060555166.

It can be written as a sum of positive squares in 2 ways, for example, as 46675442025 + 19480064041 = 216045^2 + 139571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1272221245 + ... + 1272221296.

Almost surely, 2^66155506066 is an apocalyptic number.

66155506066 is a deficient number, since it is larger than the sum of its proper divisors (40711080698).

66155506066 is a wasteful number, since it uses less digits than its factorization.

66155506066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544442556.

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 66155506066 in words is "sixty-six billion, one hundred fifty-five million, five hundred six thousand, sixty-six".