1285256651264 has 40 divisors (see below), whose sum is σ = 2679655366080. Its totient is φ = 614687958016.

The previous prime is 1285256651227. The next prime is 1285256651267. The reversal of 1285256651264 is 4621566525821.

It is not an unprimeable number, because it can be changed into a prime (1285256651267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54559244 + ... + 54582795.

It is an arithmetic number, because the mean of its divisors is an integer number (66991384152).

Almost surely, 2^{1285256651264} is an apocalyptic number.

It is an amenable number.

1285256651264 is an abundant number, since it is smaller than the sum of its proper divisors (1394398714816).

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

1285256651264 is an equidigital number, since it uses as much as digits as its factorization.

1285256651264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109142080 (or 109142064 counting only the distinct ones).

The product of its digits is 6912000, while the sum is 53.

The spelling of 1285256651264 in words is "one trillion, two hundred eighty-five billion, two hundred fifty-six million, six hundred fifty-one thousand, two hundred sixty-four".