402851285409 has 4 divisors (see below), whose sum is σ = 537135047216. Its totient is φ = 268567523604.

The previous prime is 402851285401. The next prime is 402851285453. The reversal of 402851285409 is 904582158204.

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 not a de Polignac number, because 402851285409 - 2³ = 402851285401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402851285401) 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, 67141880899 + ... + 67141880904.

It is an arithmetic number, because the mean of its divisors is an integer number (134283761804).

Almost surely, 2^402851285409 is an apocalyptic number.

It is an amenable number.

402851285409 is a deficient number, since it is larger than the sum of its proper divisors (134283761807).

402851285409 is a wasteful number, since it uses less digits than its factorization.

402851285409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134283761806.

The product of its (nonzero) digits is 921600, while the sum is 48.

The spelling of 402851285409 in words is "four hundred two billion, eight hundred fifty-one million, two hundred eighty-five thousand, four hundred nine".