66474805 has 4 divisors (see below), whose sum is σ = 79769772. Its totient is φ = 53179840.

The previous prime is 66474803. The next prime is 66474841. The reversal of 66474805 is 50847466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50847466 = 2 ⋅25423733.

It can be written as a sum of positive squares in 2 ways, for example, as 8608356 + 57866449 = 2934^2 + 7607^2 .

It is not a de Polignac number, because 66474805 - 2¹ = 66474803 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66474803) 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, 6647476 + ... + 6647485.

It is an arithmetic number, because the mean of its divisors is an integer number (19942443).

Almost surely, 2^66474805 is an apocalyptic number.

It is an amenable number.

66474805 is a deficient number, since it is larger than the sum of its proper divisors (13294967).

66474805 is a wasteful number, since it uses less digits than its factorization.

66474805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13294966.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 66474805 is about 8153.2082642356. The cubic root of 66474805 is about 405.0907788176.

The spelling of 66474805 in words is "sixty-six million, four hundred seventy-four thousand, eight hundred five".