66196505 has 4 divisors (see below), whose sum is σ = 79435812. Its totient is φ = 52957200.

The previous prime is 66196477. The next prime is 66196517. The reversal of 66196505 is 50569166.

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 21827584 + 44368921 = 4672^2 + 6661^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66196505 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, 6619646 + ... + 6619655.

It is an arithmetic number, because the mean of its divisors is an integer number (19858953).

Almost surely, 2^66196505 is an apocalyptic number.

It is an amenable number.

66196505 is a deficient number, since it is larger than the sum of its proper divisors (13239307).

66196505 is a wasteful number, since it uses less digits than its factorization.

66196505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13239306.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 66196505 is about 8136.1234626817. The cubic root of 66196505 is about 404.5246773367.

The spelling of 66196505 in words is "sixty-six million, one hundred ninety-six thousand, five hundred five".