1585557611887 has 2 divisors, whose sum is σ = 1585557611888. Its totient is φ = 1585557611886.

The previous prime is 1585557611863. The next prime is 1585557611929. The reversal of 1585557611887 is 7881167555851.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1585557611887 is a prime.

It is a super-2 number, since 2×1585557611887² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1585557611857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 792778805943 + 792778805944.

It is an arithmetic number, because the mean of its divisors is an integer number (792778805944).

Almost surely, 2^{1585557611887} is an apocalyptic number.

1585557611887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1585557611887 is an equidigital number, since it uses as much as digits as its factorization.

1585557611887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080000, while the sum is 67.

The spelling of 1585557611887 in words is "one trillion, five hundred eighty-five billion, five hundred fifty-seven million, six hundred eleven thousand, eight hundred eighty-seven".