11782077787 has 6 divisors (see below), whose sum is σ = 12056807972. Its totient is φ = 11507380752.

The previous prime is 11782077781. The next prime is 11782077809. The reversal of 11782077787 is 78777028711.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-11782077787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11782077781) 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 5 ways as a sum of consecutive naturals, for example, 703503 + ... + 720055.

Almost surely, 2^11782077787 is an apocalyptic number.

11782077787 is a deficient number, since it is larger than the sum of its proper divisors (274730185).

11782077787 is an frugal number, since it uses more digits than its factorization.

11782077787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33149 (or 16596 counting only the distinct ones).

The product of its (nonzero) digits is 2151296, while the sum is 55.

The spelling of 11782077787 in words is "eleven billion, seven hundred eighty-two million, seventy-seven thousand, seven hundred eighty-seven".