53666215 has 4 divisors (see below), whose sum is σ = 64399464. Its totient is φ = 42932968.

The previous prime is 53666213. The next prime is 53666227. The reversal of 53666215 is 51266635.

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 53666215 - 2¹ = 53666213 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 (53666213) 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, 5366617 + ... + 5366626.

It is an arithmetic number, because the mean of its divisors is an integer number (16099866).

Almost surely, 2^53666215 is an apocalyptic number.

53666215 is a deficient number, since it is larger than the sum of its proper divisors (10733249).

53666215 is a wasteful number, since it uses less digits than its factorization.

53666215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10733248.

The product of its digits is 32400, while the sum is 34.

The square root of 53666215 is about 7325.7228312297. The cubic root of 53666215 is about 377.1959219643.

The spelling of 53666215 in words is "fifty-three million, six hundred sixty-six thousand, two hundred fifteen".