11778521378 has 8 divisors (see below), whose sum is σ = 19026842268. Its totient is φ = 5436240624.

The previous prime is 11778521297. The next prime is 11778521389. The reversal of 11778521378 is 87312587711.

It can be written as a sum of positive squares in 2 ways, for example, as 11520372889 + 258148489 = 107333^2 + 16067^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226510001 + ... + 226510052.

Almost surely, 2^11778521378 is an apocalyptic number.

11778521378 is a deficient number, since it is larger than the sum of its proper divisors (7248320890).

11778521378 is a wasteful number, since it uses less digits than its factorization.

11778521378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453020068.

The product of its digits is 658560, while the sum is 50.

The spelling of 11778521378 in words is "eleven billion, seven hundred seventy-eight million, five hundred twenty-one thousand, three hundred seventy-eight".