66314881 has 2 divisors, whose sum is σ = 66314882. Its totient is φ = 66314880.

The previous prime is 66314867. The next prime is 66314887. The reversal of 66314881 is 18841366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53290000 + 13024881 = 7300^2 + 3609^2 .

It is a cyclic number.

It is not a de Polignac number, because 66314881 - 2⁵ = 66314849 is a prime.

It is a super-2 number, since 2×66314881² = 8795326884088322, 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 66314881.

It is not a weakly prime, because it can be changed into another prime (66314887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33157440 + 33157441.

It is an arithmetic number, because the mean of its divisors is an integer number (33157441).

Almost surely, 2^66314881 is an apocalyptic number.

It is an amenable number.

66314881 is a deficient number, since it is larger than the sum of its proper divisors (1).

66314881 is an equidigital number, since it uses as much as digits as its factorization.

66314881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 37.

The square root of 66314881 is about 8143.3949308627. The cubic root of 66314881 is about 404.7656643669.

The spelling of 66314881 in words is "sixty-six million, three hundred fourteen thousand, eight hundred eighty-one".