1285646465821 has 16 divisors (see below), whose sum is σ = 1346908268160. Its totient is φ = 1224836585280.

The previous prime is 1285646465783. The next prime is 1285646465861.

1285646465821 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1285646465821 - 2⁹ = 1285646465309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285646465861) 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 15 ways as a sum of consecutive naturals, for example, 11677810 + ... + 11787388.

It is an arithmetic number, because the mean of its divisors is an integer number (84181766760).

Almost surely, 2^{1285646465821} is an apocalyptic number.

It is an amenable number.

1285646465821 is a deficient number, since it is larger than the sum of its proper divisors (61261802339).

1285646465821 is a wasteful number, since it uses less digits than its factorization.

1285646465821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111636.

The product of its digits is 22118400, while the sum is 58.

The spelling of 1285646465821 in words is "one trillion, two hundred eighty-five billion, six hundred forty-six million, four hundred sixty-five thousand, eight hundred twenty-one".