66897676810 has 36 divisors (see below), whose sum is σ = 121916669238. Its totient is φ = 26429616576.

The previous prime is 66897676777. The next prime is 66897676841. The reversal of 66897676810 is 1867679866.

It can be written as a sum of positive squares in 3 ways, for example, as 32776567849 + 34121108961 = 181043^2 + 184719^2 .

It is a super-2 number, since 2×66897676810² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 72793531 + ... + 72794449.

Almost surely, 2^66897676810 is an apocalyptic number.

66897676810 is a deficient number, since it is larger than the sum of its proper divisors (55018992428).

66897676810 is an frugal number, since it uses more digits than its factorization.

66897676810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023 (or 1015 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 64.

The spelling of 66897676810 in words is "sixty-six billion, eight hundred ninety-seven million, six hundred seventy-six thousand, eight hundred ten".