66253765271 has 4 divisors (see below), whose sum is σ = 66270012000. Its totient is φ = 66237518544.

The previous prime is 66253765267. The next prime is 66253765289. The reversal of 66253765271 is 17256735266.

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

It is a cyclic number.

It is not a de Polignac number, because 66253765271 - 2² = 66253765267 is a prime.

It is a super-2 number, since 2×66253765271² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66253765231) 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, 8117246 + ... + 8125403.

It is an arithmetic number, because the mean of its divisors is an integer number (16567503000).

Almost surely, 2^66253765271 is an apocalyptic number.

66253765271 is a deficient number, since it is larger than the sum of its proper divisors (16246729).

66253765271 is a wasteful number, since it uses less digits than its factorization.

66253765271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16246728.

The product of its digits is 3175200, while the sum is 50.

The spelling of 66253765271 in words is "sixty-six billion, two hundred fifty-three million, seven hundred sixty-five thousand, two hundred seventy-one".