11687487347857 has 4 divisors (see below), whose sum is σ = 11847589914340. Its totient is φ = 11527384781376.

The previous prime is 11687487347819. The next prime is 11687487347867. The reversal of 11687487347857 is 75874378478611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8390517496321 + 3296969851536 = 2896639^2 + 1815756^2 .

It is a cyclic number.

It is not a de Polignac number, because 11687487347857 - 2⁷ = 11687487347729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11687487347867) 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, 80051283132 + ... + 80051283277.

It is an arithmetic number, because the mean of its divisors is an integer number (2961897478585).

Almost surely, 2^{11687487347857} is an apocalyptic number.

It is an amenable number.

11687487347857 is a deficient number, since it is larger than the sum of its proper divisors (160102566483).

11687487347857 is an equidigital number, since it uses as much as digits as its factorization.

11687487347857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160102566482.

The product of its digits is 1770209280, while the sum is 76.

The spelling of 11687487347857 in words is "eleven trillion, six hundred eighty-seven billion, four hundred eighty-seven million, three hundred forty-seven thousand, eight hundred fifty-seven".