11778566 has 4 divisors (see below), whose sum is σ = 17667852. Its totient is φ = 5889282.

The previous prime is 11778563. The next prime is 11778581. The reversal of 11778566 is 66587711.

11778566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66587711 = 5683 ⋅11717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11778563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2944640 + ... + 2944643.

It is an arithmetic number, because the mean of its divisors is an integer number (4416963).

Almost surely, 2^11778566 is an apocalyptic number.

11778566 is a deficient number, since it is larger than the sum of its proper divisors (5889286).

11778566 is an equidigital number, since it uses as much as digits as its factorization.

11778566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5889285.

The product of its digits is 70560, while the sum is 41.

The square root of 11778566 is about 3431.9915501061. The cubic root of 11778566 is about 227.5258820129.

The spelling of 11778566 in words is "eleven million, seven hundred seventy-eight thousand, five hundred sixty-six".