1166778946 has 8 divisors (see below), whose sum is σ = 1766225340. Its totient is φ = 578037168.

The previous prime is 1166778913. The next prime is 1166778947. The reversal of 1166778946 is 6498776611.

It can be written as a sum of positive squares in 2 ways, for example, as 1147515625 + 19263321 = 33875^2 + 4389^2 .

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

It is a super-2 number, since 2×1166778946² = 2722746217657741832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1166778947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2675881 + ... + 2676316.

Almost surely, 2^1166778946 is an apocalyptic number.

1166778946 is a deficient number, since it is larger than the sum of its proper divisors (599446394).

1166778946 is a wasteful number, since it uses less digits than its factorization.

1166778946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5352308.

The product of its digits is 3048192, while the sum is 55.

The square root of 1166778946 is about 34158.1461147996. The cubic root of 1166778946 is about 1052.7603697949.

The spelling of 1166778946 in words is "one billion, one hundred sixty-six million, seven hundred seventy-eight thousand, nine hundred forty-six".