66415530 has 32 divisors (see below), whose sum is σ = 161647488. Its totient is φ = 17460800.

The previous prime is 66415529. The next prime is 66415541. The reversal of 66415530 is 3551466.

It is a super-2 number, since 2×66415530² = 8822045250361800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 15 ways as a sum of consecutive naturals, for example, 13461 + ... + 17720.

It is an arithmetic number, because the mean of its divisors is an integer number (5051484).

Almost surely, 2^66415530 is an apocalyptic number.

66415530 is an abundant number, since it is smaller than the sum of its proper divisors (95231958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66415530 is a wasteful number, since it uses less digits than its factorization.

66415530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31262.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 66415530 is about 8149.5723814198. The cubic root of 66415530 is about 404.9703377148.

Adding to 66415530 its reverse (3551466), we get a palindrome (69966996).

The spelling of 66415530 in words is "sixty-six million, four hundred fifteen thousand, five hundred thirty".