66698105 has 4 divisors (see below), whose sum is σ = 80037732. Its totient is φ = 53358480.

The previous prime is 66698083. The next prime is 66698119. The reversal of 66698105 is 50189666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50189666 = 2 ⋅25094833.

It can be written as a sum of positive squares in 2 ways, for example, as 31899904 + 34798201 = 5648^2 + 5899^2 .

It is not a de Polignac number, because 66698105 - 2¹⁸ = 66435961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6669806 + ... + 6669815.

It is an arithmetic number, because the mean of its divisors is an integer number (20009433).

Almost surely, 2^66698105 is an apocalyptic number.

It is an amenable number.

66698105 is a deficient number, since it is larger than the sum of its proper divisors (13339627).

66698105 is a wasteful number, since it uses less digits than its factorization.

66698105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13339626.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 66698105 is about 8166.8907792378. The cubic root of 66698105 is about 405.5438611197.

The spelling of 66698105 in words is "sixty-six million, six hundred ninety-eight thousand, one hundred five".