66261653853 has 4 divisors (see below), whose sum is σ = 88348871808. Its totient is φ = 44174435900.

The previous prime is 66261653849. The next prime is 66261653867. The reversal of 66261653853 is 35835616266.

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 66261653853 - 2² = 66261653849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66261653796 and 66261653805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66261673853) 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, 11043608973 + ... + 11043608978.

It is an arithmetic number, because the mean of its divisors is an integer number (22087217952).

Almost surely, 2^66261653853 is an apocalyptic number.

It is an amenable number.

66261653853 is a deficient number, since it is larger than the sum of its proper divisors (22087217955).

66261653853 is a wasteful number, since it uses less digits than its factorization.

66261653853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22087217954.

The product of its digits is 4665600, while the sum is 51.

The spelling of 66261653853 in words is "sixty-six billion, two hundred sixty-one million, six hundred fifty-three thousand, eight hundred fifty-three".