66415406 has 8 divisors (see below), whose sum is σ = 99672600. Its totient is φ = 33191208.

The previous prime is 66415373. The next prime is 66415463. The reversal of 66415406 is 60451466.

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

It is a super-2 number, since 2×66415406² = 8822012308289672, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 2381 + ... + 11768.

It is an arithmetic number, because the mean of its divisors is an integer number (12459075).

Almost surely, 2^66415406 is an apocalyptic number.

66415406 is a deficient number, since it is larger than the sum of its proper divisors (33257194).

66415406 is a wasteful number, since it uses less digits than its factorization.

66415406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16498.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 66415406 is about 8149.5647736551. The cubic root of 66415406 is about 404.9700856836.

The spelling of 66415406 in words is "sixty-six million, four hundred fifteen thousand, four hundred six".