1285687556331 has 8 divisors (see below), whose sum is σ = 1717685448000. Its totient is φ = 855407351112.

The previous prime is 1285687556323. The next prime is 1285687556347. The reversal of 1285687556331 is 1336557865821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1285687556331 - 2³ = 1285687556323 is a prime.

It is a super-2 number, since 2×1285687556331² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1285687556381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429419865 + ... + 429422858.

It is an arithmetic number, because the mean of its divisors is an integer number (214710681000).

Almost surely, 2^{1285687556331} is an apocalyptic number.

1285687556331 is a deficient number, since it is larger than the sum of its proper divisors (431997891669).

1285687556331 is an equidigital number, since it uses as much as digits as its factorization.

1285687556331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858843225.

The product of its digits is 36288000, while the sum is 60.

The spelling of 1285687556331 in words is "one trillion, two hundred eighty-five billion, six hundred eighty-seven million, five hundred fifty-six thousand, three hundred thirty-one".