278556545655872 has 84 divisors (see below), whose sum is σ = 607905345497520. Its totient is φ = 126548786876160.

The previous prime is 278556545655803. The next prime is 278556545655901.

278556545655872 is nontrivially palindromic in base 10.

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, 4824779 + ... + 24091317.

It is an arithmetic number, because the mean of its divisors is an integer number (7236968398780).

Almost surely, 2^{278556545655872} is an apocalyptic number.

278556545655872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278556545655872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303952672748760).

278556545655872 is an abundant number, since it is smaller than the sum of its proper divisors (329348799841648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

278556545655872 is a wasteful number, since it uses less digits than its factorization.

278556545655872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19268440 (or 19268419 counting only the distinct ones).

The product of its digits is 28224000000, while the sum is 80.

The spelling of 278556545655872 in words is "two hundred seventy-eight trillion, five hundred fifty-six billion, five hundred forty-five million, six hundred fifty-five thousand, eight hundred seventy-two".