66719407 has 6 divisors (see below), whose sum is σ = 70875248. Its totient is φ = 62794464.

The previous prime is 66719363. The next prime is 66719417. The reversal of 66719407 is 70491766.

It is not a de Polignac number, because 66719407 - 2¹⁹ = 66195119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66719407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66719417) 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 5 ways as a sum of consecutive naturals, for example, 115143 + ... + 115720.

Almost surely, 2^66719407 is an apocalyptic number.

66719407 is a deficient number, since it is larger than the sum of its proper divisors (4155841).

66719407 is a wasteful number, since it uses less digits than its factorization.

66719407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230897 (or 230880 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 66719407 is about 8168.1948434155. The cubic root of 66719407 is about 405.5870306410.

The spelling of 66719407 in words is "sixty-six million, seven hundred nineteen thousand, four hundred seven".