1166201778 has 16 divisors (see below), whose sum is σ = 2665604160. Its totient is φ = 333200496.

The previous prime is 1166201761. The next prime is 1166201789. The reversal of 1166201778 is 8771026611.

It is a super-2 number, since 2×1166201778² = 2720053174020722568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13883313 + ... + 13883396.

It is an arithmetic number, because the mean of its divisors is an integer number (166600260).

Almost surely, 2^1166201778 is an apocalyptic number.

1166201778 is an abundant number, since it is smaller than the sum of its proper divisors (1499402382).

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

1166201778 is a wasteful number, since it uses less digits than its factorization.

1166201778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27766721.

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 1166201778 is about 34149.6966018733. The cubic root of 1166201778 is about 1052.5867522710.

The spelling of 1166201778 in words is "one billion, one hundred sixty-six million, two hundred one thousand, seven hundred seventy-eight".