66415506 has 8 divisors (see below), whose sum is σ = 132831024. Its totient is φ = 22138500.

The previous prime is 66415501. The next prime is 66415511. The reversal of 66415506 is 60551466.

It is an interprime number because it is at equal distance from previous prime (66415501) and next prime (66415511).

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

66415506 is an admirable number.

It is a super-2 number, since 2×66415506² = 8822038874472072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66415501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5534620 + ... + 5534631.

It is an arithmetic number, because the mean of its divisors is an integer number (16603878).

Almost surely, 2^66415506 is an apocalyptic number.

66415506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66415506 is a wasteful number, since it uses less digits than its factorization.

66415506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11069256.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 66415506 is about 8149.5709089497. The cubic root of 66415506 is about 404.9702889346.

The spelling of 66415506 in words is "sixty-six million, four hundred fifteen thousand, five hundred six".