66517013 has 4 divisors (see below), whose sum is σ = 67644480. Its totient is φ = 65389548.

The previous prime is 66517007. The next prime is 66517019. The reversal of 66517013 is 31071566.

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 an interprime number because it is at equal distance from previous prime (66517007) and next prime (66517019).

It is a cyclic number.

It is not a de Polignac number, because 66517013 - 2⁶ = 66516949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66517019) 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, 563645 + ... + 563762.

It is an arithmetic number, because the mean of its divisors is an integer number (16911120).

Almost surely, 2^66517013 is an apocalyptic number.

It is an amenable number.

66517013 is a deficient number, since it is larger than the sum of its proper divisors (1127467).

66517013 is a wasteful number, since it uses less digits than its factorization.

66517013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127466.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 66517013 is about 8155.7962823994. The cubic root of 66517013 is about 405.1764977808.

Adding to 66517013 its reverse (31071566), we get a palindrome (97588579).

The spelling of 66517013 in words is "sixty-six million, five hundred seventeen thousand, thirteen".