11571554587 has 4 divisors (see below), whose sum is σ = 12074665680. Its totient is φ = 11068443496.

The previous prime is 11571554573. The next prime is 11571554641. The reversal of 11571554587 is 78545517511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78545517511 = 419 ⋅187459469.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11571554587 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 11571554587.

It is not an unprimeable number, because it can be changed into a prime (11571554557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251555512 + ... + 251555557.

It is an arithmetic number, because the mean of its divisors is an integer number (3018666420).

Almost surely, 2^11571554587 is an apocalyptic number.

11571554587 is a deficient number, since it is larger than the sum of its proper divisors (503111093).

11571554587 is an equidigital number, since it uses as much as digits as its factorization.

11571554587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503111092.

The product of its digits is 980000, while the sum is 49.

The spelling of 11571554587 in words is "eleven billion, five hundred seventy-one million, five hundred fifty-four thousand, five hundred eighty-seven".