66820053 has 4 divisors (see below), whose sum is σ = 89093408. Its totient is φ = 44546700.

The previous prime is 66820051. The next prime is 66820073. The reversal of 66820053 is 35002866.

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 66820053 - 2¹ = 66820051 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 66820053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66820051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11136673 + ... + 11136678.

It is an arithmetic number, because the mean of its divisors is an integer number (22273352).

Almost surely, 2^66820053 is an apocalyptic number.

It is an amenable number.

66820053 is a deficient number, since it is larger than the sum of its proper divisors (22273355).

66820053 is a wasteful number, since it uses less digits than its factorization.

66820053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22273354.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 66820053 is about 8174.3533689216. The cubic root of 66820053 is about 405.7908703998.

The spelling of 66820053 in words is "sixty-six million, eight hundred twenty thousand, fifty-three".