66700215 has 24 divisors (see below), whose sum is σ = 116052768. Its totient is φ = 35438400.

The previous prime is 66700201. The next prime is 66700217. The reversal of 66700215 is 51200766.

It is not a de Polignac number, because 66700215 - 2¹¹ = 66698167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66700217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9790 + ... + 15140.

It is an arithmetic number, because the mean of its divisors is an integer number (4835532).

Almost surely, 2^66700215 is an apocalyptic number.

66700215 is a deficient number, since it is larger than the sum of its proper divisors (49352553).

66700215 is a wasteful number, since it uses less digits than its factorization.

66700215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5639 (or 5636 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 66700215 is about 8167.0199583447. The cubic root of 66700215 is about 405.5481375456.

The spelling of 66700215 in words is "sixty-six million, seven hundred thousand, two hundred fifteen".