11689507985 has 4 divisors (see below), whose sum is σ = 14027409588. Its totient is φ = 9351606384.

The previous prime is 11689507981. The next prime is 11689507987. The reversal of 11689507985 is 58970598611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58970598611 = 2083 ⋅28310417.

It can be written as a sum of positive squares in 2 ways, for example, as 3385377856 + 8304130129 = 58184^2 + 91127^2 .

It is a cyclic number.

It is not a de Polignac number, because 11689507985 - 2² = 11689507981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11689507981) 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, 1168950794 + ... + 1168950803.

It is an arithmetic number, because the mean of its divisors is an integer number (3506852397).

Almost surely, 2^11689507985 is an apocalyptic number.

It is an amenable number.

11689507985 is a deficient number, since it is larger than the sum of its proper divisors (2337901603).

11689507985 is an equidigital number, since it uses as much as digits as its factorization.

11689507985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337901602.

The product of its (nonzero) digits is 5443200, while the sum is 59.

The spelling of 11689507985 in words is "eleven billion, six hundred eighty-nine million, five hundred seven thousand, nine hundred eighty-five".