11778511851 has 6 divisors (see below), whose sum is σ = 17013406020. Its totient is φ = 7852341228.

The previous prime is 11778511847. The next prime is 11778511861. The reversal of 11778511851 is 15811587711.

11778511851 is a `hidden beast` number, since 1 + 17 + 78 + 511 + 8 + 51 = 666.

It is not a de Polignac number, because 11778511851 - 2² = 11778511847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11778511797 and 11778511806.

It is not an unprimeable number, because it can be changed into a prime (11778511861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 654361761 + ... + 654361778.

It is an arithmetic number, because the mean of its divisors is an integer number (2835567670).

Almost surely, 2^11778511851 is an apocalyptic number.

11778511851 is a deficient number, since it is larger than the sum of its proper divisors (5234894169).

11778511851 is a wasteful number, since it uses less digits than its factorization.

11778511851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308723545 (or 1308723542 counting only the distinct ones).

The product of its digits is 78400, while the sum is 45.

The spelling of 11778511851 in words is "eleven billion, seven hundred seventy-eight million, five hundred eleven thousand, eight hundred fifty-one".