11571781485 has 16 divisors (see below), whose sum is σ = 20198018880. Its totient is φ = 5610560640.

The previous prime is 11571781439. The next prime is 11571781541. The reversal of 11571781485 is 58418717511.

It is not a de Polignac number, because 11571781485 - 2¹² = 11571777389 is a prime.

It is a super-2 number, since 2×11571781485² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35065840 + ... + 35066169.

It is an arithmetic number, because the mean of its divisors is an integer number (1262376180).

Almost surely, 2^11571781485 is an apocalyptic number.

11571781485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11571781485 is a deficient number, since it is larger than the sum of its proper divisors (8626237395).

11571781485 is a wasteful number, since it uses less digits than its factorization.

11571781485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70132028.

The product of its digits is 313600, while the sum is 48.

The spelling of 11571781485 in words is "eleven billion, five hundred seventy-one million, seven hundred eighty-one thousand, four hundred eighty-five".