1285845109680 has 80 divisors (see below), whose sum is σ = 4011509255904. Its totient is φ = 340707993600.

The previous prime is 1285845109669. The next prime is 1285845109709. The reversal of 1285845109680 is 869015485821.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 1285845109680.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17025021 + ... + 17100380.

Almost surely, 2^{1285845109680} is an apocalyptic number.

1285845109680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285845109680 is an abundant number, since it is smaller than the sum of its proper divisors (2725664146224).

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

1285845109680 is a wasteful number, since it uses less digits than its factorization.

1285845109680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34125574 (or 34125568 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 57.

The spelling of 1285845109680 in words is "one trillion, two hundred eighty-five billion, eight hundred forty-five million, one hundred nine thousand, six hundred eighty".