66396415 has 8 divisors (see below), whose sum is σ = 79749648. Its totient is φ = 53067840.

The previous prime is 66396409. The next prime is 66396443. The reversal of 66396415 is 51469366.

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

It is not a de Polignac number, because 66396415 - 2⁷ = 66396287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 400 + ... + 11530.

It is an arithmetic number, because the mean of its divisors is an integer number (9968706).

Almost surely, 2^66396415 is an apocalyptic number.

66396415 is a deficient number, since it is larger than the sum of its proper divisors (13353233).

66396415 is a wasteful number, since it uses less digits than its factorization.

66396415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12329.

The product of its digits is 116640, while the sum is 40.

The square root of 66396415 is about 8148.3995361052. The cubic root of 66396415 is about 404.9314825918.

The spelling of 66396415 in words is "sixty-six million, three hundred ninety-six thousand, four hundred fifteen".