402843664081 has 4 divisors (see below), whose sum is σ = 402845506672. Its totient is φ = 402841821492.

The previous prime is 402843664063. The next prime is 402843664121. The reversal of 402843664081 is 180466348204.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402843664081 - 2¹³ = 402843655889 is a prime.

It is a super-3 number, since 3×402843664081³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402843664031) 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, 541035 + ... + 1048048.

It is an arithmetic number, because the mean of its divisors is an integer number (100711376668).

Almost surely, 2^402843664081 is an apocalyptic number.

It is an amenable number.

402843664081 is a deficient number, since it is larger than the sum of its proper divisors (1842591).

402843664081 is a wasteful number, since it uses less digits than its factorization.

402843664081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842590.

The product of its (nonzero) digits is 884736, while the sum is 46.

The spelling of 402843664081 in words is "four hundred two billion, eight hundred forty-three million, six hundred sixty-four thousand, eighty-one".