402144333985 has 4 divisors (see below), whose sum is σ = 482573200788. Its totient is φ = 321715467184.

The previous prime is 402144333967. The next prime is 402144333991. The reversal of 402144333985 is 589333441204.

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 257950220544 + 144194113441 = 507888^2 + 379729^2 .

It is a cyclic number.

It is not a de Polignac number, because 402144333985 - 2²³ = 402135945377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40214433394 + ... + 40214433403.

It is an arithmetic number, because the mean of its divisors is an integer number (120643300197).

Almost surely, 2^402144333985 is an apocalyptic number.

It is an amenable number.

402144333985 is a deficient number, since it is larger than the sum of its proper divisors (80428866803).

402144333985 is an equidigital number, since it uses as much as digits as its factorization.

402144333985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80428866802.

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 402144333985 in words is "four hundred two billion, one hundred forty-four million, three hundred thirty-three thousand, nine hundred eighty-five".