66719805 has 8 divisors (see below), whose sum is σ = 106751712. Its totient is φ = 35583888.

The previous prime is 66719777. The next prime is 66719857. The reversal of 66719805 is 50891766.

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

It is not a de Polignac number, because 66719805 - 2¹¹ = 66717757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2223979 + ... + 2224008.

It is an arithmetic number, because the mean of its divisors is an integer number (13343964).

Almost surely, 2^66719805 is an apocalyptic number.

It is an amenable number.

66719805 is a deficient number, since it is larger than the sum of its proper divisors (40031907).

66719805 is a wasteful number, since it uses less digits than its factorization.

66719805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4447995.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 66719805 is about 8168.2192061673. The cubic root of 66719805 is about 405.5878371196.

The spelling of 66719805 in words is "sixty-six million, seven hundred nineteen thousand, eight hundred five".