66879005 has 4 divisors (see below), whose sum is σ = 80254812. Its totient is φ = 53503200.

The previous prime is 66878983. The next prime is 66879011. The reversal of 66879005 is 50097866.

It is a happy number.

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 19695844 + 47183161 = 4438^2 + 6869^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66879005 is a prime.

It is a Duffinian number.

It is a congruent 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, 6687896 + ... + 6687905.

It is an arithmetic number, because the mean of its divisors is an integer number (20063703).

Almost surely, 2^66879005 is an apocalyptic number.

It is an amenable number.

66879005 is a deficient number, since it is larger than the sum of its proper divisors (13375807).

66879005 is a wasteful number, since it uses less digits than its factorization.

66879005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13375806.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 66879005 is about 8177.9584860771. The cubic root of 66879005 is about 405.9101716707.

The spelling of 66879005 in words is "sixty-six million, eight hundred seventy-nine thousand, five".