11512611685 has 4 divisors (see below), whose sum is σ = 13815134028. Its totient is φ = 9210089344.

The previous prime is 11512611637. The next prime is 11512611713. The reversal of 11512611685 is 58611621511.

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 9163658529 + 2348953156 = 95727^2 + 48466^2 .

It is a cyclic number.

It is not a de Polignac number, because 11512611685 - 2¹⁷ = 11512480613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151261164 + ... + 1151261173.

It is an arithmetic number, because the mean of its divisors is an integer number (3453783507).

Almost surely, 2^11512611685 is an apocalyptic number.

It is an amenable number.

11512611685 is a deficient number, since it is larger than the sum of its proper divisors (2302522343).

11512611685 is an equidigital number, since it uses as much as digits as its factorization.

11512611685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302522342.

The product of its digits is 14400, while the sum is 37.

The spelling of 11512611685 in words is "eleven billion, five hundred twelve million, six hundred eleven thousand, six hundred eighty-five".