1285560687861 has 24 divisors (see below), whose sum is σ = 1966199376960. Its totient is φ = 806606729856.

The previous prime is 1285560687823. The next prime is 1285560687863. The reversal of 1285560687861 is 1687860655821.

1285560687861 is a `hidden beast` number, since 1 + 2 + 8 + 5 + 560 + 6 + 8 + 7 + 8 + 61 = 666.

It is not a de Polignac number, because 1285560687861 - 2²³ = 1285552299253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285560687863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8687256 + ... + 8833998.

It is an arithmetic number, because the mean of its divisors is an integer number (81924974040).

Almost surely, 2^{1285560687861} is an apocalyptic number.

It is an amenable number.

1285560687861 is a deficient number, since it is larger than the sum of its proper divisors (680638689099).

1285560687861 is a wasteful number, since it uses less digits than its factorization.

1285560687861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204025 (or 204022 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 63.

The spelling of 1285560687861 in words is "one trillion, two hundred eighty-five billion, five hundred sixty million, six hundred eighty-seven thousand, eight hundred sixty-one".