1285245778427 has 32 divisors (see below), whose sum is σ = 1422907637760. Its totient is φ = 1153587427200.

The previous prime is 1285245778403. The next prime is 1285245778447. The reversal of 1285245778427 is 7248775425821.

It is not a de Polignac number, because 1285245778427 - 2⁶ = 1285245778363 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1285245778427.

It is not an unprimeable number, because it can be changed into a prime (1285245778447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84198998 + ... + 84214260.

It is an arithmetic number, because the mean of its divisors is an integer number (44465863680).

Almost surely, 2^{1285245778427} is an apocalyptic number.

1285245778427 is a deficient number, since it is larger than the sum of its proper divisors (137661859333).

1285245778427 is a wasteful number, since it uses less digits than its factorization.

1285245778427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16523.

The product of its digits is 70246400, while the sum is 62.

The spelling of 1285245778427 in words is "one trillion, two hundred eighty-five billion, two hundred forty-five million, seven hundred seventy-eight thousand, four hundred twenty-seven".