1146777778 has 8 divisors (see below), whose sum is σ = 1766657772. Its totient is φ = 557891856.

The previous prime is 1146777763. The next prime is 1146777781. The reversal of 1146777778 is 8777776411.

It can be written as a sum of positive squares in 2 ways, for example, as 836771329 + 310006449 = 28927^2 + 17607^2 .

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

It is a super-2 number, since 2×1146777778² = 2630198544229234568, which contains 22 as substring.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7748425 + ... + 7748572.

Almost surely, 2^1146777778 is an apocalyptic number.

1146777778 is a deficient number, since it is larger than the sum of its proper divisors (619879994).

1146777778 is a wasteful number, since it uses less digits than its factorization.

1146777778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15497036.

The product of its digits is 3226944, while the sum is 55.

The square root of 1146777778 is about 33864.1075181378. The cubic root of 1146777778 is about 1046.7101194766.

The spelling of 1146777778 in words is "one billion, one hundred forty-six million, seven hundred seventy-seven thousand, seven hundred seventy-eight".