11781637788 has 48 divisors (see below), whose sum is σ = 28452372480. Its totient is φ = 3789933504.

The previous prime is 11781637787. The next prime is 11781637793. The reversal of 11781637788 is 88773618711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11781637787) 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, 822181 + ... + 836387.

It is an arithmetic number, because the mean of its divisors is an integer number (592757760).

Almost surely, 2^11781637788 is an apocalyptic number.

It is an amenable number.

11781637788 is an abundant number, since it is smaller than the sum of its proper divisors (16670734692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11781637788 is a wasteful number, since it uses less digits than its factorization.

11781637788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16626 (or 16624 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 57.

The spelling of 11781637788 in words is "eleven billion, seven hundred eighty-one million, six hundred thirty-seven thousand, seven hundred eighty-eight".