66503253 has 4 divisors (see below), whose sum is σ = 88671008. Its totient is φ = 44335500.

The previous prime is 66503251. The next prime is 66503257. The reversal of 66503253 is 35230566.

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 not a de Polignac number, because 66503253 - 2¹ = 66503251 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66503253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66503251) 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, 11083873 + ... + 11083878.

It is an arithmetic number, because the mean of its divisors is an integer number (22167752).

Almost surely, 2^66503253 is an apocalyptic number.

It is an amenable number.

66503253 is a deficient number, since it is larger than the sum of its proper divisors (22167755).

66503253 is a wasteful number, since it uses less digits than its factorization.

66503253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22167754.

The product of its (nonzero) digits is 16200, while the sum is 30.

The square root of 66503253 is about 8154.9526669380. The cubic root of 66503253 is about 405.1485569937.

The spelling of 66503253 in words is "sixty-six million, five hundred three thousand, two hundred fifty-three".