66255481 has 2 divisors, whose sum is σ = 66255482. Its totient is φ = 66255480.

The previous prime is 66255461. The next prime is 66255487. The reversal of 66255481 is 18455266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61152400 + 5103081 = 7820^2 + 2259^2 .

It is a cyclic number.

It is not a de Polignac number, because 66255481 - 2¹¹ = 66253433 is a prime.

It is a super-2 number, since 2×66255481² = 8779577525082722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66255481.

It is not a weakly prime, because it can be changed into another prime (66255487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33127740 + 33127741.

It is an arithmetic number, because the mean of its divisors is an integer number (33127741).

Almost surely, 2^66255481 is an apocalyptic number.

It is an amenable number.

66255481 is a deficient number, since it is larger than the sum of its proper divisors (1).

66255481 is an equidigital number, since it uses as much as digits as its factorization.

66255481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 37.

The square root of 66255481 is about 8139.7469862398. The cubic root of 66255481 is about 404.6447751469.

The spelling of 66255481 in words is "sixty-six million, two hundred fifty-five thousand, four hundred eighty-one".