66195005 has 4 divisors (see below), whose sum is σ = 79434012. Its totient is φ = 52956000.

The previous prime is 66195001. The next prime is 66195007. The reversal of 66195005 is 50059166.

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 47927929 + 18267076 = 6923^2 + 4274^2 .

It is not a de Polignac number, because 66195005 - 2² = 66195001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66195001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6619496 + ... + 6619505.

It is an arithmetic number, because the mean of its divisors is an integer number (19858503).

Almost surely, 2^66195005 is an apocalyptic number.

It is an amenable number.

66195005 is a deficient number, since it is larger than the sum of its proper divisors (13239007).

66195005 is a wasteful number, since it uses less digits than its factorization.

66195005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13239006.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 66195005 is about 8136.0312806675. The cubic root of 66195005 is about 404.5216218300.

The spelling of 66195005 in words is "sixty-six million, one hundred ninety-five thousand, five".