66465402281 has 4 divisors (see below), whose sum is σ = 66662629332. Its totient is φ = 66268175232.

The previous prime is 66465402187. The next prime is 66465402287. The reversal of 66465402281 is 18220456466.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20437561600 + 46027840681 = 142960^2 + 214541^2 .

It is a cyclic number.

It is not a de Polignac number, because 66465402281 - 2¹⁰ = 66465401257 is a prime.

It is a super-2 number, since 2×66465402281² (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 (66465402287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98613020 + ... + 98613693.

It is an arithmetic number, because the mean of its divisors is an integer number (16665657333).

Almost surely, 2^66465402281 is an apocalyptic number.

It is an amenable number.

66465402281 is a deficient number, since it is larger than the sum of its proper divisors (197227051).

66465402281 is a wasteful number, since it uses less digits than its factorization.

66465402281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197227050.

The product of its (nonzero) digits is 552960, while the sum is 44.

The spelling of 66465402281 in words is "sixty-six billion, four hundred sixty-five million, four hundred two thousand, two hundred eighty-one".