66500556155 has 32 divisors (see below), whose sum is σ = 87306785280. Its totient is φ = 48224574720.

The previous prime is 66500556127. The next prime is 66500556163. The reversal of 66500556155 is 55165500566.

It is not a de Polignac number, because 66500556155 - 2¹⁰ = 66500555131 is a prime.

It is a super-3 number, since 3×66500556155³ (a number of 33 digits) contains 333 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, 45578816 + ... + 45580274.

It is an arithmetic number, because the mean of its divisors is an integer number (2728337040).

Almost surely, 2^66500556155 is an apocalyptic number.

66500556155 is a deficient number, since it is larger than the sum of its proper divisors (20806229125).

66500556155 is a wasteful number, since it uses less digits than its factorization.

66500556155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299.

The product of its (nonzero) digits is 675000, while the sum is 44.

The spelling of 66500556155 in words is "sixty-six billion, five hundred million, five hundred fifty-six thousand, one hundred fifty-five".