66719497 has 8 divisors (see below), whose sum is σ = 71933960. Its totient is φ = 61516800.

The previous prime is 66719491. The next prime is 66719551. The reversal of 66719497 is 79491766.

It can be written as a sum of positive squares in 4 ways, for example, as 3182656 + 63536841 = 1784^2 + 7971^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66719497 - 2²³ = 58330889 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 66719497.

It is not an unprimeable number, because it can be changed into a prime (66719491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11497 + ... + 16297.

It is an arithmetic number, because the mean of its divisors is an integer number (8991745).

Almost surely, 2^66719497 is an apocalyptic number.

It is an amenable number.

66719497 is a deficient number, since it is larger than the sum of its proper divisors (5214463).

66719497 is a wasteful number, since it uses less digits than its factorization.

66719497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5883.

The product of its digits is 571536, while the sum is 49.

The square root of 66719497 is about 8168.2003525869. The cubic root of 66719497 is about 405.5872130108.

It can be divided in two parts, 667 and 19497, that added together give a square (20164 = 142²).

The spelling of 66719497 in words is "sixty-six million, seven hundred nineteen thousand, four hundred ninety-seven".