66612417 has 4 divisors (see below), whose sum is σ = 88816560. Its totient is φ = 44408276.

The previous prime is 66612373. The next prime is 66612419. The reversal of 66612417 is 71421666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66612417 - 2¹⁵ = 66579649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66612419) 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, 11102067 + ... + 11102072.

It is an arithmetic number, because the mean of its divisors is an integer number (22204140).

Almost surely, 2^66612417 is an apocalyptic number.

It is an amenable number.

66612417 is a deficient number, since it is larger than the sum of its proper divisors (22204143).

66612417 is a wasteful number, since it uses less digits than its factorization.

66612417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22204142.

The product of its digits is 12096, while the sum is 33.

The square root of 66612417 is about 8161.6430331153. The cubic root of 66612417 is about 405.3701173810.

Subtracting 66612417 from its reverse (71421666), we obtain a square (4809249 = 2193²).

The spelling of 66612417 in words is "sixty-six million, six hundred twelve thousand, four hundred seventeen".