11505072885 has 16 divisors (see below), whose sum is σ = 18409555584. Its totient is φ = 6135559232.

The previous prime is 11505072877. The next prime is 11505072889. The reversal of 11505072885 is 58827050511.

It is a cyclic number.

It is not a de Polignac number, because 11505072885 - 2³ = 11505072877 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11505072889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256819 + ... + 298271.

It is an arithmetic number, because the mean of its divisors is an integer number (1150597224).

Almost surely, 2^11505072885 is an apocalyptic number.

11505072885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11505072885 is a deficient number, since it is larger than the sum of its proper divisors (6904482699).

11505072885 is a wasteful number, since it uses less digits than its factorization.

11505072885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59964.

The product of its (nonzero) digits is 112000, while the sum is 42.

The spelling of 11505072885 in words is "eleven billion, five hundred five million, seventy-two thousand, eight hundred eighty-five".