1285013890566 has 128 divisors (see below), whose sum is σ = 3385737216000. Its totient is φ = 353517294240.

The previous prime is 1285013890549. The next prime is 1285013890631. The reversal of 1285013890566 is 6650983105821.

1285013890566 is a `hidden beast` number, since 1 + 2 + 8 + 501 + 3 + 89 + 0 + 56 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2056351 + ... + 2607413.

It is an arithmetic number, because the mean of its divisors is an integer number (26451072000).

Almost surely, 2^{1285013890566} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285013890566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1692868608000).

1285013890566 is an abundant number, since it is smaller than the sum of its proper divisors (2100723325434).

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

1285013890566 is a wasteful number, since it uses less digits than its factorization.

1285013890566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551311 (or 551305 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 54.

The spelling of 1285013890566 in words is "one trillion, two hundred eighty-five billion, thirteen million, eight hundred ninety thousand, five hundred sixty-six".