66802253 has 4 divisors (see below), whose sum is σ = 76345440. Its totient is φ = 57259068.

The previous prime is 66802247. The next prime is 66802273. The reversal of 66802253 is 35220866.

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 a cyclic number.

It is not a de Polignac number, because 66802253 - 2⁴ = 66802237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66802223) 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, 4771583 + ... + 4771596.

It is an arithmetic number, because the mean of its divisors is an integer number (19086360).

Almost surely, 2^66802253 is an apocalyptic number.

It is an amenable number.

66802253 is a deficient number, since it is larger than the sum of its proper divisors (9543187).

66802253 is an equidigital number, since it uses as much as digits as its factorization.

66802253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9543186.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 66802253 is about 8173.2645252677. The cubic root of 66802253 is about 405.7548347157.

The spelling of 66802253 in words is "sixty-six million, eight hundred two thousand, two hundred fifty-three".