66516717155 has 32 divisors (see below), whose sum is σ = 93891184128. Its totient is φ = 44287891200.

The previous prime is 66516717121. The next prime is 66516717161. The reversal of 66516717155 is 55171761566.

It is not a de Polignac number, because 66516717155 - 2³² = 62221749859 is a prime.

It is a super-2 number, since 2×66516717155² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 192944 + ... + 412626.

It is an arithmetic number, because the mean of its divisors is an integer number (2934099504).

Almost surely, 2^66516717155 is an apocalyptic number.

66516717155 is a deficient number, since it is larger than the sum of its proper divisors (27374466973).

66516717155 is a wasteful number, since it uses less digits than its factorization.

66516717155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219947.

The product of its digits is 1323000, while the sum is 50.

The spelling of 66516717155 in words is "sixty-six billion, five hundred sixteen million, seven hundred seventeen thousand, one hundred fifty-five".