66012415 has 16 divisors (see below), whose sum is σ = 94468608. Its totient is φ = 43297056.

The previous prime is 66012413. The next prime is 66012433. The reversal of 66012415 is 51421066.

It is a cyclic number.

It is not a de Polignac number, because 66012415 - 2¹ = 66012413 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 66012415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66012413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40197 + ... + 41806.

It is an arithmetic number, because the mean of its divisors is an integer number (5904288).

Almost surely, 2^66012415 is an apocalyptic number.

66012415 is a deficient number, since it is larger than the sum of its proper divisors (28456193).

66012415 is a wasteful number, since it uses less digits than its factorization.

66012415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82038.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 66012415 is about 8124.8024591371. The cubic root of 66012415 is about 404.1493398649.

The spelling of 66012415 in words is "sixty-six million, twelve thousand, four hundred fifteen".