11437209985 has 4 divisors (see below), whose sum is σ = 13724651988. Its totient is φ = 9149767984.

The previous prime is 11437209943. The next prime is 11437209989. The reversal of 11437209985 is 58990273411.

It is a happy number.

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 5953511281 + 5483698704 = 77159^2 + 74052^2 .

It is a cyclic number.

It is not a de Polignac number, because 11437209985 - 2¹¹ = 11437207937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11437209989) 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, 1143720994 + ... + 1143721003.

It is an arithmetic number, because the mean of its divisors is an integer number (3431162997).

Almost surely, 2^11437209985 is an apocalyptic number.

It is an amenable number.

11437209985 is a deficient number, since it is larger than the sum of its proper divisors (2287442003).

11437209985 is an equidigital number, since it uses as much as digits as its factorization.

11437209985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2287442002.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 11437209985 in words is "eleven billion, four hundred thirty-seven million, two hundred nine thousand, nine hundred eighty-five".