66808774 has 8 divisors (see below), whose sum is σ = 100275768. Its totient is φ = 33383520.

The previous prime is 66808771. The next prime is 66808783. The reversal of 66808774 is 47780866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66808771) 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, 6067 + ... + 13054.

It is an arithmetic number, because the mean of its divisors is an integer number (12534471).

Almost surely, 2^66808774 is an apocalyptic number.

66808774 is a deficient number, since it is larger than the sum of its proper divisors (33466994).

66808774 is a wasteful number, since it uses less digits than its factorization.

66808774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20870.

The product of its (nonzero) digits is 451584, while the sum is 46.

The square root of 66808774 is about 8173.6634381408. The cubic root of 66808774 is about 405.7680370708.

The spelling of 66808774 in words is "sixty-six million, eight hundred eight thousand, seven hundred seventy-four".