66430215 has 12 divisors (see below), whose sum is σ = 115145784. Its totient is φ = 35429424.

The previous prime is 66430211. The next prime is 66430229. The reversal of 66430215 is 51203466.

66430215 is a `hidden beast` number, since 6 + 643 + 0 + 2 + 15 = 666.

It is not a de Polignac number, because 66430215 - 2² = 66430211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66430211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 738069 + ... + 738158.

It is an arithmetic number, because the mean of its divisors is an integer number (9595482).

Almost surely, 2^66430215 is an apocalyptic number.

66430215 is a deficient number, since it is larger than the sum of its proper divisors (48715569).

66430215 is a wasteful number, since it uses less digits than its factorization.

66430215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476238 (or 1476235 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 66430215 is about 8150.4732991404. The cubic root of 66430215 is about 405.0001828989. Note that the first 3 decimals are identical.

The spelling of 66430215 in words is "sixty-six million, four hundred thirty thousand, two hundred fifteen".