4278052021685 has 8 divisors (see below), whose sum is σ = 5528559535800. Its totient is φ = 3159176877504.

The previous prime is 4278052021673. The next prime is 4278052021693. The reversal of 4278052021685 is 5861202508724.

It can be written as a sum of positive squares in 4 ways, for example, as 799849401649 + 3478202620036 = 894343^2 + 1864994^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4278052021685 - 2³² = 4273757054389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32908092410 + ... + 32908092539.

It is an arithmetic number, because the mean of its divisors is an integer number (691069941975).

Almost surely, 2^{4278052021685} is an apocalyptic number.

It is an amenable number.

4278052021685 is a deficient number, since it is larger than the sum of its proper divisors (1250507514115).

4278052021685 is a wasteful number, since it uses less digits than its factorization.

4278052021685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65816184967.

The product of its (nonzero) digits is 2150400, while the sum is 50.

The spelling of 4278052021685 in words is "four trillion, two hundred seventy-eight billion, fifty-two million, twenty-one thousand, six hundred eighty-five".