66550415 has 8 divisors (see below), whose sum is σ = 80651808. Its totient is φ = 52712800.

The previous prime is 66550409. The next prime is 66550441. The reversal of 66550415 is 51405566.

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

It is not a de Polignac number, because 66550415 - 2⁴ = 66550399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65387 + ... + 66396.

It is an arithmetic number, because the mean of its divisors is an integer number (10081476).

Almost surely, 2^66550415 is an apocalyptic number.

66550415 is a deficient number, since it is larger than the sum of its proper divisors (14101393).

66550415 is a wasteful number, since it uses less digits than its factorization.

66550415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131889.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 66550415 is about 8157.8437714877. The cubic root of 66550415 is about 405.2443072030.

The spelling of 66550415 in words is "sixty-six million, five hundred fifty thousand, four hundred fifteen".