66244608853 has 4 divisors (see below), whose sum is σ = 68528905740. Its totient is φ = 63960311968.

The previous prime is 66244608839. The next prime is 66244608919. The reversal of 66244608853 is 35880644266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11599936209 + 54644672644 = 107703^2 + 233762^2 .

It is a cyclic number.

It is not a de Polignac number, because 66244608853 - 2²⁵ = 66211054421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66244608853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66244608553) 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, 1142148400 + ... + 1142148457.

It is an arithmetic number, because the mean of its divisors is an integer number (17132226435).

Almost surely, 2^66244608853 is an apocalyptic number.

It is an amenable number.

66244608853 is a deficient number, since it is larger than the sum of its proper divisors (2284296887).

66244608853 is a wasteful number, since it uses less digits than its factorization.

66244608853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284296886.

The product of its (nonzero) digits is 6635520, while the sum is 52.

The spelling of 66244608853 in words is "sixty-six billion, two hundred forty-four million, six hundred eight thousand, eight hundred fifty-three".