84278961782725 has 12 divisors (see below), whose sum is σ = 107054837309700. Its totient is φ = 65778701878400.

The previous prime is 84278961782677. The next prime is 84278961782801. The reversal of 84278961782725 is 52728716987248.

It can be written as a sum of positive squares in 6 ways, for example, as 30381603826401 + 53897357956324 = 5511951^2 + 7341482^2 .

It is not a de Polignac number, because 84278961782725 - 2¹¹ = 84278961780677 is a prime.

It is a super-2 number, since 2×84278961782725² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41111687650 + ... + 41111689699.

It is an arithmetic number, because the mean of its divisors is an integer number (8921236442475).

Almost surely, 2^{84278961782725} is an apocalyptic number.

It is an amenable number.

84278961782725 is a deficient number, since it is larger than the sum of its proper divisors (22775875526975).

84278961782725 is a wasteful number, since it uses less digits than its factorization.

84278961782725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82223377400 (or 82223377395 counting only the distinct ones).

The product of its digits is 1517322240, while the sum is 76.

The spelling of 84278961782725 in words is "eighty-four trillion, two hundred seventy-eight billion, nine hundred sixty-one million, seven hundred eighty-two thousand, seven hundred twenty-five".