66012517 has 8 divisors (see below), whose sum is σ = 69782400. Its totient is φ = 62272224.

The previous prime is 66012511. The next prime is 66012539. The reversal of 66012517 is 71521066.

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

It is a cyclic number.

It is not a de Polignac number, because 66012517 - 2³ = 66012509 is a prime.

It is a super-4 number, since 4×66012517⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66012511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2728 + ... + 11809.

It is an arithmetic number, because the mean of its divisors is an integer number (8722800).

Almost surely, 2^66012517 is an apocalyptic number.

It is an amenable number.

66012517 is a deficient number, since it is larger than the sum of its proper divisors (3769883).

66012517 is a wasteful number, since it uses less digits than its factorization.

66012517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14795.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 66012517 is about 8124.8087362103. The cubic root of 66012517 is about 404.1495480238.

The spelling of 66012517 in words is "sixty-six million, twelve thousand, five hundred seventeen".