11535621985 has 12 divisors (see below), whose sum is σ = 14108875452. Its totient is φ = 9054363968.

The previous prime is 11535621971. The next prime is 11535621991. The reversal of 11535621985 is 58912653511.

It can be written as a sum of positive squares in 6 ways, for example, as 128527569 + 11407094416 = 11337^2 + 106804^2 .

It is not a de Polignac number, because 11535621985 - 2¹¹ = 11535619937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 396622 + ... + 424711.

It is an arithmetic number, because the mean of its divisors is an integer number (1175739621).

Almost surely, 2^11535621985 is an apocalyptic number.

It is an amenable number.

11535621985 is a deficient number, since it is larger than the sum of its proper divisors (2573253467).

11535621985 is an frugal number, since it uses more digits than its factorization.

11535621985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821444 (or 821391 counting only the distinct ones).

The product of its digits is 324000, while the sum is 46.

The spelling of 11535621985 in words is "eleven billion, five hundred thirty-five million, six hundred twenty-one thousand, nine hundred eighty-five".