66679505 has 4 divisors (see below), whose sum is σ = 80015412. Its totient is φ = 53343600.

The previous prime is 66679477. The next prime is 66679519. The reversal of 66679505 is 50597666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26635921 + 40043584 = 5161^2 + 6328^2 .

It is not a de Polignac number, because 66679505 - 2¹⁰ = 66678481 is a prime.

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, 6667946 + ... + 6667955.

It is an arithmetic number, because the mean of its divisors is an integer number (20003853).

Almost surely, 2^66679505 is an apocalyptic number.

It is an amenable number.

66679505 is a deficient number, since it is larger than the sum of its proper divisors (13335907).

66679505 is a wasteful number, since it uses less digits than its factorization.

66679505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13335906.

The product of its (nonzero) digits is 340200, while the sum is 44.

The square root of 66679505 is about 8165.7519555764. The cubic root of 66679505 is about 405.5061598131.

The spelling of 66679505 in words is "sixty-six million, six hundred seventy-nine thousand, five hundred five".