11787665655 has 16 divisors (see below), whose sum is σ = 19008774144. Its totient is φ = 6237252000.

The previous prime is 11787665653. The next prime is 11787665677. The reversal of 11787665655 is 55656678711.

It is not a de Polignac number, because 11787665655 - 2¹ = 11787665653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11787665595 and 11787665604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11787665653) 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 15 ways as a sum of consecutive naturals, for example, 3091971 + ... + 3095780.

It is an arithmetic number, because the mean of its divisors is an integer number (1188048384).

Almost surely, 2^11787665655 is an apocalyptic number.

11787665655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11787665655 is a deficient number, since it is larger than the sum of its proper divisors (7221108489).

11787665655 is a wasteful number, since it uses less digits than its factorization.

11787665655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6187886.

The product of its digits is 10584000, while the sum is 57.

The spelling of 11787665655 in words is "eleven billion, seven hundred eighty-seven million, six hundred sixty-five thousand, six hundred fifty-five".