11781162851 has 4 divisors (see below), whose sum is σ = 11812748112. Its totient is φ = 11749577592.

The previous prime is 11781162803. The next prime is 11781162863. The reversal of 11781162851 is 15826118711.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11781162851 - 2²⁶ = 11714053987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11781162799 and 11781162808.

It is not an unprimeable number, because it can be changed into a prime (11781162881) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15792071 + ... + 15792816.

It is an arithmetic number, because the mean of its divisors is an integer number (2953187028).

Almost surely, 2^11781162851 is an apocalyptic number.

11781162851 is a deficient number, since it is larger than the sum of its proper divisors (31585261).

11781162851 is an equidigital number, since it uses as much as digits as its factorization.

11781162851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31585260.

The product of its digits is 26880, while the sum is 41.

The spelling of 11781162851 in words is "eleven billion, seven hundred eighty-one million, one hundred sixty-two thousand, eight hundred fifty-one".