66910877105 has 4 divisors (see below), whose sum is σ = 80293052532. Its totient is φ = 53528701680.

The previous prime is 66910877093. The next prime is 66910877113. The reversal of 66910877105 is 50177801966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50177801966 = 2 ⋅25088900983.

It can be written as a sum of positive squares in 2 ways, for example, as 17633980849 + 49276896256 = 132793^2 + 221984^2 .

It is not a de Polignac number, because 66910877105 - 2²⁰ = 66909828529 is a prime.

It is a super-3 number, since 3×66910877105³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

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, 6691087706 + ... + 6691087715.

It is an arithmetic number, because the mean of its divisors is an integer number (20073263133).

Almost surely, 2^66910877105 is an apocalyptic number.

It is an amenable number.

66910877105 is a deficient number, since it is larger than the sum of its proper divisors (13382175427).

66910877105 is a wasteful number, since it uses less digits than its factorization.

66910877105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13382175426.

The product of its (nonzero) digits is 635040, while the sum is 50.

The spelling of 66910877105 in words is "sixty-six billion, nine hundred ten million, eight hundred seventy-seven thousand, one hundred five".