1285521785875 has 16 divisors (see below), whose sum is σ = 1607625579456. Its totient is φ = 1026305640000.

The previous prime is 1285521785839. The next prime is 1285521785881. The reversal of 1285521785875 is 5785871255821.

It is not a de Polignac number, because 1285521785875 - 2⁷ = 1285521785747 is a prime.

It is a Duffinian number.

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, 10497826 + ... + 10619575.

It is an arithmetic number, because the mean of its divisors is an integer number (100476598716).

Almost surely, 2^{1285521785875} is an apocalyptic number.

1285521785875 is a deficient number, since it is larger than the sum of its proper divisors (322103793581).

1285521785875 is an equidigital number, since it uses as much as digits as its factorization.

1285521785875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21117903 (or 21117893 counting only the distinct ones).

The product of its digits is 62720000, while the sum is 64.

The spelling of 1285521785875 in words is "one trillion, two hundred eighty-five billion, five hundred twenty-one million, seven hundred eighty-five thousand, eight hundred seventy-five".