11817778000 has 80 divisors (see below), whose sum is σ = 32657624064. Its totient is φ = 4051804800.

The previous prime is 11817777991. The next prime is 11817778013. The reversal of 11817778000 is 87771811.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408064 + ... + 436063.

Almost surely, 2^11817778000 is an apocalyptic number.

11817778000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11817778000 is an abundant number, since it is smaller than the sum of its proper divisors (20839846064).

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

11817778000 is an equidigital number, since it uses as much as digits as its factorization.

11817778000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844157 (or 844141 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 40.

The spelling of 11817778000 in words is "eleven billion, eight hundred seventeen million, seven hundred seventy-eight thousand".