66700715 has 4 divisors (see below), whose sum is σ = 80040864. Its totient is φ = 53360568.

The previous prime is 66700693. The next prime is 66700717. The reversal of 66700715 is 51700766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66700715 - 2¹⁰ = 66699691 is a prime.

It is a super-2 number, since 2×66700715² = 8897970763022450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66700717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6670067 + ... + 6670076.

It is an arithmetic number, because the mean of its divisors is an integer number (20010216).

Almost surely, 2^66700715 is an apocalyptic number.

66700715 is a deficient number, since it is larger than the sum of its proper divisors (13340149).

66700715 is a wasteful number, since it uses less digits than its factorization.

66700715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13340148.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 66700715 is about 8167.0505692080. The cubic root of 66700715 is about 405.5491509035.

The spelling of 66700715 in words is "sixty-six million, seven hundred thousand, seven hundred fifteen".