66100510666 has 8 divisors (see below), whose sum is σ = 102569758020. Its totient is φ = 31910591328.

The previous prime is 66100510649. The next prime is 66100510667. The reversal of 66100510666 is 66601500166.

It can be written as a sum of positive squares in 2 ways, for example, as 62061272641 + 4039238025 = 249121^2 + 63555^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66100510667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569831931 + ... + 569832046.

Almost surely, 2^66100510666 is an apocalyptic number.

66100510666 is a deficient number, since it is larger than the sum of its proper divisors (36469247354).

66100510666 is a wasteful number, since it uses less digits than its factorization.

66100510666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139664008.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 66100510666 in words is "sixty-six billion, one hundred million, five hundred ten thousand, six hundred sixty-six".