11961784415 has 16 divisors (see below), whose sum is σ = 16524482112. Its totient is φ = 8142491904.

The previous prime is 11961784357. The next prime is 11961784421. The reversal of 11961784415 is 51448716911.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11961784415 - 2¹⁴ = 11961768031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11961784415.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1242524 + ... + 1252113.

It is an arithmetic number, because the mean of its divisors is an integer number (1032780132).

Almost surely, 2^11961784415 is an apocalyptic number.

11961784415 is a deficient number, since it is larger than the sum of its proper divisors (4562697697).

11961784415 is a wasteful number, since it uses less digits than its factorization.

11961784415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2494786.

The product of its digits is 241920, while the sum is 47.

The spelling of 11961784415 in words is "eleven billion, nine hundred sixty-one million, seven hundred eighty-four thousand, four hundred fifteen".