66516253 has 8 divisors (see below), whose sum is σ = 69523200. Its totient is φ = 63518928.

The previous prime is 66516239. The next prime is 66516271. The reversal of 66516253 is 35261566.

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 66516253 - 2¹⁷ = 66385181 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 (66516293) 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, 14268 + ... + 18346.

It is an arithmetic number, because the mean of its divisors is an integer number (8690400).

Almost surely, 2^66516253 is an apocalyptic number.

It is an amenable number.

66516253 is a deficient number, since it is larger than the sum of its proper divisors (3006947).

66516253 is a wasteful number, since it uses less digits than its factorization.

66516253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4811.

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

The square root of 66516253 is about 8155.7496896361. The cubic root of 66516253 is about 405.1749546402.

The spelling of 66516253 in words is "sixty-six million, five hundred sixteen thousand, two hundred fifty-three".