66275868481 has 9 divisors (see below), whose sum is σ = 67864347201. Its totient is φ = 64723756692.

The previous prime is 66275868479. The next prime is 66275868487. The reversal of 66275868481 is 18486857266.

The square root of 66275868481 is 257441.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 66275868481 - 2¹ = 66275868479 is a prime.

It is a super-2 number, since 2×66275868481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66275868487) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11066970 + ... + 11072956.

Almost surely, 2^66275868481 is an apocalyptic number.

66275868481 is the 257441-st square number.

66275868481 is the 128721-st centered octagonal number.

It is an amenable number.

66275868481 is a deficient number, since it is larger than the sum of its proper divisors (1588478720).

66275868481 is an frugal number, since it uses more digits than its factorization.

66275868481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12060 (or 6030 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 61.

The spelling of 66275868481 in words is "sixty-six billion, two hundred seventy-five million, eight hundred sixty-eight thousand, four hundred eighty-one".