11771553678 has 32 divisors (see below), whose sum is σ = 25732131840. Its totient is φ = 3573905280.

The previous prime is 11771553671. The next prime is 11771553691. The reversal of 11771553678 is 87635517711.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 11771553678.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11771553671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1858248 + ... + 1864571.

It is an arithmetic number, because the mean of its divisors is an integer number (804129120).

Almost surely, 2^11771553678 is an apocalyptic number.

11771553678 is an abundant number, since it is smaller than the sum of its proper divisors (13960578162).

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

11771553678 is a wasteful number, since it uses less digits than its factorization.

11771553678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722872.

The product of its digits is 1234800, while the sum is 51.

The spelling of 11771553678 in words is "eleven billion, seven hundred seventy-one million, five hundred fifty-three thousand, six hundred seventy-eight".