66876905 has 4 divisors (see below), whose sum is σ = 80252292. Its totient is φ = 53501520.

The previous prime is 66876883. The next prime is 66876917. The reversal of 66876905 is 50967866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50967866 = 2 ⋅25483933.

It can be written as a sum of positive squares in 2 ways, for example, as 25441936 + 41434969 = 5044^2 + 6437^2 .

It is not a de Polignac number, because 66876905 - 2¹⁸ = 66614761 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66876905.

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, 6687686 + ... + 6687695.

It is an arithmetic number, because the mean of its divisors is an integer number (20063073).

Almost surely, 2^66876905 is an apocalyptic number.

It is an amenable number.

66876905 is a deficient number, since it is larger than the sum of its proper divisors (13375387).

66876905 is a wasteful number, since it uses less digits than its factorization.

66876905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13375386.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 66876905 is about 8177.8300911672. The cubic root of 66876905 is about 405.9059231013.

The spelling of 66876905 in words is "sixty-six million, eight hundred seventy-six thousand, nine hundred five".