66719701 has 4 divisors (see below), whose sum is σ = 66756492. Its totient is φ = 66682912.

The previous prime is 66719693. The next prime is 66719707. The reversal of 66719701 is 10791766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10791766 = 2 ⋅5395883.

It can be written as a sum of positive squares in 2 ways, for example, as 54982225 + 11737476 = 7415^2 + 3426^2 .

It is a cyclic number.

It is not a de Polignac number, because 66719701 - 2³ = 66719693 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66719707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15526 + ... + 19351.

It is an arithmetic number, because the mean of its divisors is an integer number (16689123).

Almost surely, 2^66719701 is an apocalyptic number.

It is an amenable number.

66719701 is a deficient number, since it is larger than the sum of its proper divisors (36791).

66719701 is a wasteful number, since it uses less digits than its factorization.

66719701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36790.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 66719701 is about 8168.2128400281. The cubic root of 66719701 is about 405.5876263818.

The spelling of 66719701 in words is "sixty-six million, seven hundred nineteen thousand, seven hundred one".