66415430 has 32 divisors (see below), whose sum is σ = 127842624. Its totient is φ = 24754176.

The previous prime is 66415373. The next prime is 66415463. The reversal of 66415430 is 3451466.

It is a happy number.

It is a super-2 number, since 2×66415430² = 8822018684169800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66415393 and 66415402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15614 + ... + 19406.

It is an arithmetic number, because the mean of its divisors is an integer number (3995082).

Almost surely, 2^66415430 is an apocalyptic number.

66415430 is a deficient number, since it is larger than the sum of its proper divisors (61427194).

66415430 is a wasteful number, since it uses less digits than its factorization.

66415430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3920.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 66415430 is about 8149.5662461262. The cubic root of 66415430 is about 404.9701344639.

Adding to 66415430 its reverse (3451466), we get a palindrome (69866896).

The spelling of 66415430 in words is "sixty-six million, four hundred fifteen thousand, four hundred thirty".